Colour:
Colour is the visual perceptual property corresponding in humans to the categories called red, yellow, blue, black, etc. Colour derives from the spectrum of light interacting in the eye with the spectral sensitivities of the light receptors.
White light is a mixture of different colours and when it passes through a glass prism, the light splits up into the colours you see in a rainbow. Spectrum, (white light) consists of Red, Orange, Yellow, Green, Blue, Indigo and Violet. The separation of splitting of white light into its separate colours is known as ‘Dispersion’. The colours of the spectrum can be recombined by using a second prism or spinning a colour wheel, we can get white light.
Mixing Coloured Lights
The primary colours of light are red, blue, and green. You can get white light or any other colour by mixing just three colours. If you mix two primary colours at a time, you will get magenta, yellow, and cyan.
Colour Filters
Colour filter is the clear plastic or glass which only lets through some of the colours meanwhile the other colours is being absorbed.
When white light (spectrum) shines on a coloured object, some of the colours in the spectrum are reflected and some are being absorbed. We can see the colour that is reflected light.
Credits:
http://en.wikipedia.org/wiki/Colour
http://wolfstone.halloweenhost.com/Lighting/colmix_ColorMixing.html
Explore Your World with SCIENCE DISCOVERY 2 [Chapter 8.4, colour]
Showing posts with label colours. Show all posts
Showing posts with label colours. Show all posts
Friday, June 20, 2008
Colours of Light by 2E4 Jeremy Lim
In this topic I have learn about how colours are produce , what is dispersion of light and to recombine colours back after spitting them and also what is the effect of mixing colours as well as what is primary colours.
White light which is also known as ordinary light actually is a mixture of different colours. And when that white light pass through a glass prism the light actually spits up into 7 different colours and that process is call dispersion.
The spectrum consist of 7 beautiful colours, they are red, orange, yellow, green, blue, indigo, violet. It is also difficult to say when one colours ends or start as these colours merge into one another gradually.
The reason why there is always (maybe) a rainbow after a shower of rain is because the raindrops act like small prism and when sunlight passes through them …. They form the colours of the spectrum.
And since we are able to separate those seven colours from the spectrum, thus we are also able to rejoin the seven colours back into white light. And in order to do that is 2 ways.
The first way is to add in another prism or to spin a colour wheel and another
name for the colour wheel is call a Newton disc.
Lights of different colours can be mixed together to produce other colours and in fact white light and light of other colours can be obtained by mixing 3 colours, these colours are red, blue , green. These colours are called primary colours.
Here are the *formula* of colours, red + blue = magenta, red+ green = yellow, blue + green = cyan. And by adding the 3 primary we get white colours.
Clear plastic or glass only let through some colours and the other colours are absorbed are call colour filter. When white light shines on a coloured object, some colour are reflected and some are absorbed.
To end my project work, I want to say that the colour of an object is the colour of the light that is reflected from it into our eyes. And if no light is reflected the object would be black. Black is not a colour it is just something that indicates the absence of light.
Text book resource*
White light which is also known as ordinary light actually is a mixture of different colours. And when that white light pass through a glass prism the light actually spits up into 7 different colours and that process is call dispersion.
The spectrum consist of 7 beautiful colours, they are red, orange, yellow, green, blue, indigo, violet. It is also difficult to say when one colours ends or start as these colours merge into one another gradually.
The reason why there is always (maybe) a rainbow after a shower of rain is because the raindrops act like small prism and when sunlight passes through them …. They form the colours of the spectrum.
And since we are able to separate those seven colours from the spectrum, thus we are also able to rejoin the seven colours back into white light. And in order to do that is 2 ways.
The first way is to add in another prism or to spin a colour wheel and another
name for the colour wheel is call a Newton disc.
Lights of different colours can be mixed together to produce other colours and in fact white light and light of other colours can be obtained by mixing 3 colours, these colours are red, blue , green. These colours are called primary colours.
Here are the *formula* of colours, red + blue = magenta, red+ green = yellow, blue + green = cyan. And by adding the 3 primary we get white colours.
Clear plastic or glass only let through some colours and the other colours are absorbed are call colour filter. When white light shines on a coloured object, some colour are reflected and some are absorbed.
To end my project work, I want to say that the colour of an object is the colour of the light that is reflected from it into our eyes. And if no light is reflected the object would be black. Black is not a colour it is just something that indicates the absence of light.
Text book resource*
Colours of Light by 2E4 Jun Min Jung
How are colours being produced?
Colours are produced because of sun light(white light).
What is Dispersion of light?
The speed of light is slower in various than it is in a vacuum or outer space. When the light passes into a material at an angle, the light beam is bent or refracted according to Snell’s Law and the index of retraction of the material. But also, the speed of light through a material varies slightly with the wavelength or frequency of the light. Thus, each wavelength is refracted at a slightly different angle when passing through a material at an angle. This spreading out of the beam of light is called dispersion. This can be seen when sunlight passes through a glass prism.
How to get rainbow colours and to recombine colours again?
Rainbow is formed when sunlight (white light) passes through raindrops. Tiny droplets of water refract the white light from the sun and create a spectrum of colours similar to what happen in a prism. Since the droplets are spheres, the light is reflected internally in the droplets and the rainbow returns toward the direction of the light.
Since white light consists of seven colours, we should be able to get white light again by combining the colours together. There are two ways to recombine the colours.
• By using a second prism: When another prism is placed, the colours recombine.
• Spinning a colour wheel (also called a Newton’s disc\): When the wheel is turned quickly, the colours appear to mix and the wheel looks white.
What is primary colours?
Light of different colours can be mixed together to produce other colours. In fact, white light and other light of colours – red, blue and green. These three colours are called the primary colours.
Effects of Mixing of Colours
Mixing the primary colours two at a time gives the following colours:
• red + blue = green
• red + green = yellow
• blue + green = cyan
Mixing all three primary colours gives white light. That is:
• red + blue + green = white
http://www.school-for-champions.com/science/light_dispersion.htm
Textbook - p.128~p.130
Colours are produced because of sun light(white light).
What is Dispersion of light?
The speed of light is slower in various than it is in a vacuum or outer space. When the light passes into a material at an angle, the light beam is bent or refracted according to Snell’s Law and the index of retraction of the material. But also, the speed of light through a material varies slightly with the wavelength or frequency of the light. Thus, each wavelength is refracted at a slightly different angle when passing through a material at an angle. This spreading out of the beam of light is called dispersion. This can be seen when sunlight passes through a glass prism.
How to get rainbow colours and to recombine colours again?
Rainbow is formed when sunlight (white light) passes through raindrops. Tiny droplets of water refract the white light from the sun and create a spectrum of colours similar to what happen in a prism. Since the droplets are spheres, the light is reflected internally in the droplets and the rainbow returns toward the direction of the light.
Since white light consists of seven colours, we should be able to get white light again by combining the colours together. There are two ways to recombine the colours.
• By using a second prism: When another prism is placed, the colours recombine.
• Spinning a colour wheel (also called a Newton’s disc\): When the wheel is turned quickly, the colours appear to mix and the wheel looks white.
What is primary colours?
Light of different colours can be mixed together to produce other colours. In fact, white light and other light of colours – red, blue and green. These three colours are called the primary colours.
Effects of Mixing of Colours
Mixing the primary colours two at a time gives the following colours:
• red + blue = green
• red + green = yellow
• blue + green = cyan
Mixing all three primary colours gives white light. That is:
• red + blue + green = white
http://www.school-for-champions.com/science/light_dispersion.htm
Textbook - p.128~p.130
Colours of Light by 2E1 Vaishnavi
In this essay I am going to explain about our physics project. My topic was colours. From the project we have understood many things about colours.
Colour is simply light of different wavelengths and frequencies and light is just one form of energy that we can actually see.
The three primary colours are red, green and blue. Colour comes from light.
To see the colour physically we need to have a prism. When light from the sun passes through a prism, the light is split into the seven visible colours by refraction.
Refraction is caused by the change in speed experienced by a wave of light when it changes medium. The amount of energy in a given light wave is proportionally related to its frequency, thus a high frequency light wave has a higher energy than that of a low frequency.
Each colour has its own particular wavelength and frequency. Each colour can be measured in units of cycles or waves per second. The frequency of a wave is determined by the number of complete waves, or wavelengths, that pass a given point each second.
Higher frequency colours are - violet - indigo - blue lower frequency colours are - yellow - orange - red.
A high frequency light wave has a higher energy than that of a low frequency light wave.
Colours of Light by 2E1 Edgar Wong
How are colors produced?
Colors are produced when a light source hits a prism, which separates the white light into its separate colors are called dispersion.
How to get rainbow colors and to recombine the colors again?
Place a second prism positioned in a way that each other’s points are facing away from each other. Shine the light through both prisms.
What are primary colors?
The three primary colors are the minimum number of colors that can be mixed to make the greatest number of other colors. The primary colors cannot be made by mixing other colors.
Effects of mixing of colors.
When you mix colors together, you will get a different color. If you mix the three primary colors together, you get white.
What do you learn about that particular topic?
I’ve learn about the dispersion of white light by a prism and more about the primary colors.
Summarize the key points of that topic.
Colors, they are produced by white light hitting prisms, when lights separates its called dispersion. Placing two prisms facing away from each other can get and recombine colors. When mixing colors together, you get a different color.
Anything interesting to add?
The spectrum consists of: Red, Orange, Blue, Yellow, Green, Indigo and Violet.
Prisms separate the colors already present in the white light.
Credits.
Science Discovery, Rex M Heyworth, 128, 129 and 130, chapter 8
Color Mixing, Robert Truscio.
Colors are produced when a light source hits a prism, which separates the white light into its separate colors are called dispersion.
How to get rainbow colors and to recombine the colors again?
Place a second prism positioned in a way that each other’s points are facing away from each other. Shine the light through both prisms.
What are primary colors?
The three primary colors are the minimum number of colors that can be mixed to make the greatest number of other colors. The primary colors cannot be made by mixing other colors.
Effects of mixing of colors.
When you mix colors together, you will get a different color. If you mix the three primary colors together, you get white.
What do you learn about that particular topic?
I’ve learn about the dispersion of white light by a prism and more about the primary colors.
Summarize the key points of that topic.
Colors, they are produced by white light hitting prisms, when lights separates its called dispersion. Placing two prisms facing away from each other can get and recombine colors. When mixing colors together, you get a different color.
Anything interesting to add?
The spectrum consists of: Red, Orange, Blue, Yellow, Green, Indigo and Violet.
Prisms separate the colors already present in the white light.
Credits.
Science Discovery, Rex M Heyworth, 128, 129 and 130, chapter 8
Color Mixing, Robert Truscio.
Colours of Light by 2E1 Marcus Choo
Colour :
I have learnt that white light, ( ordinary light ), is a mixture of different colours. When a beam of white light passes through a glass prism, the light splits into seven different colours : Red, Orange, Yellow, Green, Blue, Indigo, Violet. We can get white light back again by combining the colours back together. By using a second prism, or by spinning a colour wheel.
We can see the colours of the spectrum, so it is called the visible spectrum. Some people think the there are only six colours as indigo cannot be easily distinguished from blue and violet.
There are three sections : primary colours, secondary colours and teitary colour. Primary colours consist of : Red, Blue and Green.
Secondary colours consist of : Yellow, Cyan and Magenta.
While teitary colour consist of only : White.
A colour filter is a clear plastic or glass that only lets some colours pass through and absorbs the others.
When white light shines on a colours object, some of the colours in the spectrum are reflected and some are absorbed. We see the colour of the reflected light. The colour of an object is the colour of the light that is reflected from it into our eyes.
When the eye detects light, an image is formed on the retina, ( the back of the eye ). The retina has two kinds of light sensitive cells, they are called the rods and the cones. These cells are connected to a nerve which carries signals to the brain, the brain than interprets the signals as light. The rods do not detect colour, they are sensitive to black and white, and work best in dim light. The cones however, detect colour and work best in bright light.
There are tree types of cone cells, one detects red light, another detects blue light and the other detects green light. This means that these cone cells can detect the three primary colours. When white light shines into the eye, all three types of cones respond. For example the cones which detect red light respond to the red light in the white light and the brain receives signals from all these types of cones and interprets them as white light.
I have learnt that white light, ( ordinary light ), is a mixture of different colours. When a beam of white light passes through a glass prism, the light splits into seven different colours : Red, Orange, Yellow, Green, Blue, Indigo, Violet. We can get white light back again by combining the colours back together. By using a second prism, or by spinning a colour wheel.
We can see the colours of the spectrum, so it is called the visible spectrum. Some people think the there are only six colours as indigo cannot be easily distinguished from blue and violet.
There are three sections : primary colours, secondary colours and teitary colour. Primary colours consist of : Red, Blue and Green.
Secondary colours consist of : Yellow, Cyan and Magenta.
While teitary colour consist of only : White.
A colour filter is a clear plastic or glass that only lets some colours pass through and absorbs the others.
When white light shines on a colours object, some of the colours in the spectrum are reflected and some are absorbed. We see the colour of the reflected light. The colour of an object is the colour of the light that is reflected from it into our eyes.
When the eye detects light, an image is formed on the retina, ( the back of the eye ). The retina has two kinds of light sensitive cells, they are called the rods and the cones. These cells are connected to a nerve which carries signals to the brain, the brain than interprets the signals as light. The rods do not detect colour, they are sensitive to black and white, and work best in dim light. The cones however, detect colour and work best in bright light.
There are tree types of cone cells, one detects red light, another detects blue light and the other detects green light. This means that these cone cells can detect the three primary colours. When white light shines into the eye, all three types of cones respond. For example the cones which detect red light respond to the red light in the white light and the brain receives signals from all these types of cones and interprets them as white light.
Colours of Light by 2E3 Nur Hasyimah
I’ve learned more about colours, such as the three primary colours, the secondary colours, and lastly, the rainbow. I find that learning about rainbows is the most interesting part of this topic.
Colour is a part of the human vision system. Colours derive from the spectrum of light interacting in the eye with the spectral sensitivities of the light receptors. Dispersion of light is the separation of splitting of white light into its separate colours.
The three primary colours are red, blue, and green. Primary colours are sets of colours that can be combined to make a useful range of colours. Mixing of pigments or dyes, such as in printing, the primaries normally used are magenta, cyan and yellow. A secondary colour is a colour made by mixing two primary colours in a given colour space. For example, yellow is a secondary colour because when you mix red and green, you will get yellow.
Rainbows cause a spectrum of light to appear in the sky when the sun shines onto droplets of moisture in the earth’s atmosphere. Rainbows consist of both the primary and the secondary colours. There are seven colours in a rainbow.
There are red, orange, yellow, green, blue, indigo and violet. Rainbows can also be caused by other forms of water than rain, including mist, spray, dew, fog and ice. Rainbows can have shapes other than a bow, including stripes, circles, or even flames. Rainbows can be seen whenever there are water drops in the air and sunlight shining from behind a person on the ground. They are commonly seen near waterfalls or fountains.
Resources:
http://en.wikipedia.org/wiki/Rainbows
http://en.wikipedia.org/wiki/Primary_colours
http://en.wikipedia.org/wiki/Secondary_colours
http://en.wikipedia.org/wiki/Colours
Colour is a part of the human vision system. Colours derive from the spectrum of light interacting in the eye with the spectral sensitivities of the light receptors. Dispersion of light is the separation of splitting of white light into its separate colours.
The three primary colours are red, blue, and green. Primary colours are sets of colours that can be combined to make a useful range of colours. Mixing of pigments or dyes, such as in printing, the primaries normally used are magenta, cyan and yellow. A secondary colour is a colour made by mixing two primary colours in a given colour space. For example, yellow is a secondary colour because when you mix red and green, you will get yellow.
Rainbows cause a spectrum of light to appear in the sky when the sun shines onto droplets of moisture in the earth’s atmosphere. Rainbows consist of both the primary and the secondary colours. There are seven colours in a rainbow.
There are red, orange, yellow, green, blue, indigo and violet. Rainbows can also be caused by other forms of water than rain, including mist, spray, dew, fog and ice. Rainbows can have shapes other than a bow, including stripes, circles, or even flames. Rainbows can be seen whenever there are water drops in the air and sunlight shining from behind a person on the ground. They are commonly seen near waterfalls or fountains.
Resources:
http://en.wikipedia.org/wiki/Rainbows
http://en.wikipedia.org/wiki/Primary_colours
http://en.wikipedia.org/wiki/Secondary_colours
http://en.wikipedia.org/wiki/Colours
Colours of light by 2E3 Neo Chin Yen
In this topic, I get to learn the combination and recombination of rainbow colours, and how the colours are being produced, and the effects of mixing all primary colours. I also learnt that colour is a function of the human visual system, and is not an intrinsic property.
Objects don't "have" color, they give off light that "appears" to be a color. Spectral power distributions exist in the physical world, but color exists only in the mind of the beholder.
Color is the perceptual quality of light.
The color of the light coming from an object has its origin in one or more of the following processes …
emission: the object itself is a source of light with a color determined by its spectra
reflection: certain frequencies are reflected from the object while others are not
transmission: certain frequencies are transmitted through the object while others are not
interference: certain frequencies are amplified by constructive interference while others are attenuated by destructive interference
dispersion: the angular separation of a polychromatic light wave by frequency during refraction
scattering: the preferential reradiation of certain frequencies of light striking small, dispersed particles
Something interesting I want to share are some historical junks.
The painter's color wheel is a historical artifact that refuses to die. The primary colors are not red, yellow, and blue. Painters and art teachers promote this scheme. It is a convenient way to understand how to mimic one color by mixing red, yellow, and blue. But these colors do not satisfy the definition of primary colors in that they can't reproduce the widest variety of colors when combined.
Cyan, magenta, and yellow have a greater chromatic range as evidenced by their ability to produce a reasonable black. No combination of red, yellow, and blue pigments will approach black as closely as do cyan, magenta, and yellow.
The website I got all my informations are from www.hypertextbook.com/physics/
Objects don't "have" color, they give off light that "appears" to be a color. Spectral power distributions exist in the physical world, but color exists only in the mind of the beholder.
Color is the perceptual quality of light.
The color of the light coming from an object has its origin in one or more of the following processes …
emission: the object itself is a source of light with a color determined by its spectra
reflection: certain frequencies are reflected from the object while others are not
transmission: certain frequencies are transmitted through the object while others are not
interference: certain frequencies are amplified by constructive interference while others are attenuated by destructive interference
dispersion: the angular separation of a polychromatic light wave by frequency during refraction
scattering: the preferential reradiation of certain frequencies of light striking small, dispersed particles
Something interesting I want to share are some historical junks.
The painter's color wheel is a historical artifact that refuses to die. The primary colors are not red, yellow, and blue. Painters and art teachers promote this scheme. It is a convenient way to understand how to mimic one color by mixing red, yellow, and blue. But these colors do not satisfy the definition of primary colors in that they can't reproduce the widest variety of colors when combined.
Cyan, magenta, and yellow have a greater chromatic range as evidenced by their ability to produce a reasonable black. No combination of red, yellow, and blue pigments will approach black as closely as do cyan, magenta, and yellow.
The website I got all my informations are from www.hypertextbook.com/physics/
Colours of Light by 2E2 Riesky
The colors are being produced when light passes through a prism and dispersion is the separation or splitting of white light into its separate colors.
The most famous example of dispersion is a rainbow, in which dispersion causes the spatial separation of a white light into components of different colors. However, dispersion is the most often explained for light waves, but it possibly occur for any kind of wave that interacts with a medium or passes through an inhomogeneous geometry. On the other hand dispersion also has an impact in my other circumstances.
Ordinary light (white light )is really a mixture of different colors. When a beam of white light passes through a glass prism, the light splits up into the colors you see is a rainbow. These colors are called the spectrum of white light.
The spectrum consists of seven colors: Red, Orange, Yellow, Green, Blue, Indigo and Violet or You can remember the order of the seven colors as a boy’s name: ROY G BIV. As these colors merge one into another gradually, it is difficult to say exactly where one colors ends and the next colors starts.
A rainbow is formed when sunlight (white light) passes through raindrops. These drops of water act as small prisms. The white light separates to form the colors of the spectrum.
Since white light consists of seven colors, we should be able to get white light again by combining the colors together. There are 2 ways:
By using a second prism
Spinning a color wheel
White light and light of other colors can be obtained by mixing just three colors – red, blue and green.
These colors are called the primary colors of light.
There are 2 basic ways colors can be mixed to make other colors. One is by combining color light. Mixing color light is called additive color mixing, because the combined colors are formed by the adding of light from 2 or more light sources together. Two or more lights added together will give more illumination than any of the lights by them selves.
If colored light is mixed together, the brightness of the colored lights are added together. This can be seen where the color illumination overlaps. The yellow mixed from red plus green will be brighter than either the red light or green light alone.
Likewise the color cyan is formed by adding green light and blue light. The cyan is also brighter than its two components.
green light + blue light = cyan
The same goes for the magenta and its mixture of red and blue.
red light + blue light = magenta
White light is formed where all three additive primary colors overlap. Since the white mixture results from the adding of all three color light sources, the white light mixture appears even brighter yet.
PRIMARY COLORS OF LIGHT
By varying the amount of the individual light sources, a full range of colors can be obtained. Television screens and PC monitors use the additive color process.
(http://en.wikipedia.org/wiki/Dispersion_(optics)
(http://home.att.net/~RTRUSCIO/COLORMX.htm)
Text book pg (128, 129 and 130)
The most famous example of dispersion is a rainbow, in which dispersion causes the spatial separation of a white light into components of different colors. However, dispersion is the most often explained for light waves, but it possibly occur for any kind of wave that interacts with a medium or passes through an inhomogeneous geometry. On the other hand dispersion also has an impact in my other circumstances.
Ordinary light (white light )is really a mixture of different colors. When a beam of white light passes through a glass prism, the light splits up into the colors you see is a rainbow. These colors are called the spectrum of white light.
The spectrum consists of seven colors: Red, Orange, Yellow, Green, Blue, Indigo and Violet or You can remember the order of the seven colors as a boy’s name: ROY G BIV. As these colors merge one into another gradually, it is difficult to say exactly where one colors ends and the next colors starts.
A rainbow is formed when sunlight (white light) passes through raindrops. These drops of water act as small prisms. The white light separates to form the colors of the spectrum.
Since white light consists of seven colors, we should be able to get white light again by combining the colors together. There are 2 ways:
By using a second prism
Spinning a color wheel
White light and light of other colors can be obtained by mixing just three colors – red, blue and green.
These colors are called the primary colors of light.
There are 2 basic ways colors can be mixed to make other colors. One is by combining color light. Mixing color light is called additive color mixing, because the combined colors are formed by the adding of light from 2 or more light sources together. Two or more lights added together will give more illumination than any of the lights by them selves.
If colored light is mixed together, the brightness of the colored lights are added together. This can be seen where the color illumination overlaps. The yellow mixed from red plus green will be brighter than either the red light or green light alone.
Likewise the color cyan is formed by adding green light and blue light. The cyan is also brighter than its two components.
green light + blue light = cyan
The same goes for the magenta and its mixture of red and blue.
red light + blue light = magenta
White light is formed where all three additive primary colors overlap. Since the white mixture results from the adding of all three color light sources, the white light mixture appears even brighter yet.
PRIMARY COLORS OF LIGHT
By varying the amount of the individual light sources, a full range of colors can be obtained. Television screens and PC monitors use the additive color process.
(http://en.wikipedia.org/wiki/Dispersion_(optics)
(http://home.att.net/~RTRUSCIO/COLORMX.htm)
Text book pg (128, 129 and 130)
Colours of light by 2E2 Liow Fang Yu
Colours of light
I learnt that sunlight may appear white, but it is actually made up of a mixture of seven colours. When the sunlight passes through the rain drop, the raindrop split the white sunlight into a range or spectrum of colours. The colours that makes the spectrum are red, orange, yellow, green, blue, indigo and violet.
We can see the colours of the spectrum, so it is called the visible spectrum . I learnt that I can also remember the order of the seven colours as a boy’s name: ROY G BIV
I learnt that when the splitting or separation of whit light into a spectrum of colours is called the dispersion of white light.
As the refracted colours of light leave the prism, they are bent again, but not in their original paths. This is because the face of the prism through which the light leaves is not parallel to the face through which it enters.
I learnt that to prove that white light is a mixture of different colours, another prism can be used to recombine the colours of its spectrum. Another way of combining the different colours of a spectrum is by spinning a rainbow-coloured disc called Newton’s disc.
I learnt that when a white light is a mixture of different colours, another prism can be used to recombine the colours of its spectrum. I learnt that white light and light of other colours can be obtained by lust mixing three colours. These three colours are red, blue and green. These three colours are called the primary colours of light.
Mixing the primary colours two at a time gives the following colours:
RED + BLUE = MAGENTA
RED + GREEN = YELLOW
BLUE + GREEN = CYAN
A colour television works in the same way. The picture on the television screen is made of dots of coloured light. A mixture of red, green and blue dots in different combinations and varying amounts of brightness produces the different colours in the picture.
These information can be found in : Interactive Science 2 (book) pg113 to119 and
Explore your world with science discovery 2 (book) pg128 to 130.
I learnt that sunlight may appear white, but it is actually made up of a mixture of seven colours. When the sunlight passes through the rain drop, the raindrop split the white sunlight into a range or spectrum of colours. The colours that makes the spectrum are red, orange, yellow, green, blue, indigo and violet.
We can see the colours of the spectrum, so it is called the visible spectrum . I learnt that I can also remember the order of the seven colours as a boy’s name: ROY G BIV
I learnt that when the splitting or separation of whit light into a spectrum of colours is called the dispersion of white light.
As the refracted colours of light leave the prism, they are bent again, but not in their original paths. This is because the face of the prism through which the light leaves is not parallel to the face through which it enters.
I learnt that to prove that white light is a mixture of different colours, another prism can be used to recombine the colours of its spectrum. Another way of combining the different colours of a spectrum is by spinning a rainbow-coloured disc called Newton’s disc.
I learnt that when a white light is a mixture of different colours, another prism can be used to recombine the colours of its spectrum. I learnt that white light and light of other colours can be obtained by lust mixing three colours. These three colours are red, blue and green. These three colours are called the primary colours of light.
Mixing the primary colours two at a time gives the following colours:
RED + BLUE = MAGENTA
RED + GREEN = YELLOW
BLUE + GREEN = CYAN
A colour television works in the same way. The picture on the television screen is made of dots of coloured light. A mixture of red, green and blue dots in different combinations and varying amounts of brightness produces the different colours in the picture.
These information can be found in : Interactive Science 2 (book) pg113 to119 and
Explore your world with science discovery 2 (book) pg128 to 130.
Colours of Light by 2E3 Mageshwary
In this topic I learned about colours, what causes the colours in a rainbow, what is a spectrum, what is called dispersion, what are the seven main colours of the visible spectrum, what are the primary colours and the mixing of colours.
The key points of this topic are, a spectrum is a band of colours. The rainbow is a spectrum of white (ordinary) light into its component colours, white light can be dispersed using a prism, the spectrum of white light consist of seven colours: red, orange, yellow, green, blue, indigo, and violet,
The colours of the spectrum can be recombined to give white light, rainbows are formed by the dispersion of white light by raindrops,
red, green and blue are the primary colours of light, white light can be combined by mixing red, green and blue lights, a colour filter is clear plastic or glass that lets through some colours but absorbs the others, a red filter allows red light to pass through, an object has an certain colour because it reflects light of that colour and absorbs light of other colours.
The interesting things are that a prism can be used to break apart white light into its component colours. This shows that white light is a mixture of the projected colours.
Although the spectrum shows that white light contains a continuous rage of colours, colours from just three areas of the spectrum could be mixed to form any other colour including white. These three colours of light are from the red, green and blue parts of the spectrum. When the three primary colours of light is being added. This can be seen where the primary colour illumination over laps. The yellow formed when red light is added to green light is equal to the illumination of the red and green combined.
This information is taken from the school science text book and,http://home.att.net/~B-P.TRUSIO/COLOR.htm
The key points of this topic are, a spectrum is a band of colours. The rainbow is a spectrum of white (ordinary) light into its component colours, white light can be dispersed using a prism, the spectrum of white light consist of seven colours: red, orange, yellow, green, blue, indigo, and violet,
The colours of the spectrum can be recombined to give white light, rainbows are formed by the dispersion of white light by raindrops,
red, green and blue are the primary colours of light, white light can be combined by mixing red, green and blue lights, a colour filter is clear plastic or glass that lets through some colours but absorbs the others, a red filter allows red light to pass through, an object has an certain colour because it reflects light of that colour and absorbs light of other colours.
The interesting things are that a prism can be used to break apart white light into its component colours. This shows that white light is a mixture of the projected colours.
Although the spectrum shows that white light contains a continuous rage of colours, colours from just three areas of the spectrum could be mixed to form any other colour including white. These three colours of light are from the red, green and blue parts of the spectrum. When the three primary colours of light is being added. This can be seen where the primary colour illumination over laps. The yellow formed when red light is added to green light is equal to the illumination of the red and green combined.
This information is taken from the school science text book and,http://home.att.net/~B-P.TRUSIO/COLOR.htm
Thursday, June 19, 2008
Colours of Light by 2E2 Lee Yen Ting
Colours of light.
I learnt that when a beam of white light passes through a glass prism, the light splits up into the colours we in a rainbow. These colours are called the spectrum of white lights. Dispersion of light is when the separation or splitting of white light into its separate colours.
White light consists of seven colours, we should be able to get white light again by combining the colours together. Here are the ways:
One is by spinning a colours wheel: when the wheel is turned quickly, the colours appear to mix and the wheel looks white.
Primary colours are colours that can be obtained by mixing with just three colours – red, Blue and green. Mixing all three primary colours gives white light.
By mixing the primary colours two at a time gives the following colours:
Red + Blue = magenta
Red + green = yellow
Blue + green = cyan
The key points is that Rainbow is formed when a beam of white light passes through a glass prism and the light splits up into the colours we see in a rainbow. Light of different colours can be mixed together to produce other colours.
The spectrum consists of seven colours: Red, Orange, Yellow, Green, Blue, Indigo and Violet. We could remember the order as a boy’s name: ROY G BIV.
These colours formed as a colour wheel and when the colours wheel spins, the colours appear to mix and the wheel looks white as mention above how to combine the colours together to get white light again.
These information can be found in Explore Your World with SCIENCE DISCOVERY 2 page 128 – 130.
I learnt that when a beam of white light passes through a glass prism, the light splits up into the colours we in a rainbow. These colours are called the spectrum of white lights. Dispersion of light is when the separation or splitting of white light into its separate colours.
White light consists of seven colours, we should be able to get white light again by combining the colours together. Here are the ways:
One is by spinning a colours wheel: when the wheel is turned quickly, the colours appear to mix and the wheel looks white.
Primary colours are colours that can be obtained by mixing with just three colours – red, Blue and green. Mixing all three primary colours gives white light.
By mixing the primary colours two at a time gives the following colours:
Red + Blue = magenta
Red + green = yellow
Blue + green = cyan
The key points is that Rainbow is formed when a beam of white light passes through a glass prism and the light splits up into the colours we see in a rainbow. Light of different colours can be mixed together to produce other colours.
The spectrum consists of seven colours: Red, Orange, Yellow, Green, Blue, Indigo and Violet. We could remember the order as a boy’s name: ROY G BIV.
These colours formed as a colour wheel and when the colours wheel spins, the colours appear to mix and the wheel looks white as mention above how to combine the colours together to get white light again.
These information can be found in Explore Your World with SCIENCE DISCOVERY 2 page 128 – 130.
Colours of light by 2E2 Billy A.
How are colours being produced? The colour are produced when light pass through a prism. The process is called dispersion. The most familiar example of dispersion is probably a rainbow, in which dispersion causes the spatial separation of a white light into components of different wavelengths (different colors).
However, dispersion also has an impact in many other circumstances: for example, it causes pulses to spread in optical fibers, degrading signals over long distances; also, a cancellation between dispersion and nonlinear effects leads to soliton waves. Dispersion is most often described for light waves, but it may occur for any kind of wave that interacts with a medium or passes through an inhomogeneous geometry (e.g. a waveguide), such as sound waves. Dispersion is sometimes called chromatic dispersion to emphasize its wavelength-dependent nature.
Sunlight is often called white light, since it is a combination of all the visible colours. Since the index of refraction is different for each colour, the angle of refraction will be different for each colour when the light passes from air into glass or other transparent material. This is according to Snell's Law. (See Snell's Law for the Refraction of Light for more information.)
Now if the piece of glass has parallel sides--such as with a window--the light will return in the same direction that it entered the material. But if the material is shaped like a prism, the angles for each colour will be exaggerated, and the colours will be displayed as a spectrum of light
The visible colours are in the order of the spectrum. You can remember the order by the name ROY G. BIV. Note that in the illustration above, the colours are distinctly separated. In realty, they blend into each other, such that there are colours in between. For example, there is red-orange in between red and orange. To get it back just reverse the process.
The primary colours red, blue, and green. these colours are then mixed to make secondary colours and if the three colours are mixed, it will make the colour white.
In optics and physics, Snell's law (also known as Descartes' law or the law of diffraction), is a formula used to describe the relationship between the angles of incidence and refraction, when referring to light or other waves, passing through a boundary between two different isotropic media, such as water and glass. The law says that the ratio of the sine’s of the angles of incidence and of refraction is a constant that depends on the media.
In optics, the law is used in ray tracing to compute the angles of incidence or refraction, and in experimental optics to find the refractive index of a material.
Refraction of light at the interface between two media of different refractive indices, with n2 > n1. Since the velocity is lower in the second medium (v2 < v1), the angle of refraction θ2 is less than the angle of incidence θ1; that is, the ray in the higher-index medium is closer to the normal.
Named after Dutch mathematician Willebrord Snellius, one of its discoverers,
Snell's law states that the ratio of the sine’s of the angles of incidence and refraction is equivalent to the ratio of velocities in the two media, or equivalent to the opposite ratio of the indices of refraction:
or
Snell's law follows from Fermat's principle of least time, which in turn follows from the propagation of light as waves.
SOURCE
-wikipedia
-books
-encarta
-my brain
However, dispersion also has an impact in many other circumstances: for example, it causes pulses to spread in optical fibers, degrading signals over long distances; also, a cancellation between dispersion and nonlinear effects leads to soliton waves. Dispersion is most often described for light waves, but it may occur for any kind of wave that interacts with a medium or passes through an inhomogeneous geometry (e.g. a waveguide), such as sound waves. Dispersion is sometimes called chromatic dispersion to emphasize its wavelength-dependent nature.
Sunlight is often called white light, since it is a combination of all the visible colours. Since the index of refraction is different for each colour, the angle of refraction will be different for each colour when the light passes from air into glass or other transparent material. This is according to Snell's Law. (See Snell's Law for the Refraction of Light for more information.)
Now if the piece of glass has parallel sides--such as with a window--the light will return in the same direction that it entered the material. But if the material is shaped like a prism, the angles for each colour will be exaggerated, and the colours will be displayed as a spectrum of light
The visible colours are in the order of the spectrum. You can remember the order by the name ROY G. BIV. Note that in the illustration above, the colours are distinctly separated. In realty, they blend into each other, such that there are colours in between. For example, there is red-orange in between red and orange. To get it back just reverse the process.
The primary colours red, blue, and green. these colours are then mixed to make secondary colours and if the three colours are mixed, it will make the colour white.
In optics and physics, Snell's law (also known as Descartes' law or the law of diffraction), is a formula used to describe the relationship between the angles of incidence and refraction, when referring to light or other waves, passing through a boundary between two different isotropic media, such as water and glass. The law says that the ratio of the sine’s of the angles of incidence and of refraction is a constant that depends on the media.
In optics, the law is used in ray tracing to compute the angles of incidence or refraction, and in experimental optics to find the refractive index of a material.
Refraction of light at the interface between two media of different refractive indices, with n2 > n1. Since the velocity is lower in the second medium (v2 < v1), the angle of refraction θ2 is less than the angle of incidence θ1; that is, the ray in the higher-index medium is closer to the normal.
Named after Dutch mathematician Willebrord Snellius, one of its discoverers,
Snell's law states that the ratio of the sine’s of the angles of incidence and refraction is equivalent to the ratio of velocities in the two media, or equivalent to the opposite ratio of the indices of refraction:
or
Snell's law follows from Fermat's principle of least time, which in turn follows from the propagation of light as waves.
SOURCE
-wikipedia
-books
-encarta
-my brain
Colours of Light by 2E3 Ho Zong Hua
Dispersion of White Light and How are colours produced
Sunlight may appear white, but it is actually made up of a mixture of seven colours. When the sunlight passes through the raindrops, the raindrops split the sunlight into a range or a spectrum of colours. The colours that make up the spectrum are red, orange, yellow, green, blue, indigo and violet. The spitting of white light into a range or a spectrum is called the dispersion of white light.
Dispersion of White Light and How are colours produced
When a beam of white light enters a prism, it slows down and is refracted. The white light is then split into seven different visible colours of light. Which are red, orange, yellow, green, blue, indigo and violet. The seven different colours of light, which make up white light, slow down at different rates. In other words, the different colours of light are refracted or bent at different angles.
Point 2
How to get rainbow colours and to recombine it again
What is primary colours
What are the effects of mixing colours
As the refracted colours of light leave the prism, they are bent again, but not in their original paths. This is because the face of the prism through which the light leaves is not parallel to the face through which it enters.
To prove that white light is a mixture of different colours, another prism can be used to recombine the colours of its spectrum.
Another way of combining the different colours of spectrum is by spinning a rainbow-coloured disc called Newton’s disc.
Primary colours are green, red and blue; these three colours when mixed will form the white light.
Cyan, yellow and magenta are called secondary colours. They are produced by mixing any two of the three primary colours.
Cyan = blue + green
Yellow = red + green
Magenta = red + blue
Mixing all the three primary colours will give the white light
Red + blue + green = white
By using different brightness we can create all the colours of the rainbow and many other colours that go to make up our multicolored world.
Sunlight may appear white, but it is actually made up of a mixture of seven colours. When the sunlight passes through the raindrops, the raindrops split the sunlight into a range or a spectrum of colours. The colours that make up the spectrum are red, orange, yellow, green, blue, indigo and violet. The spitting of white light into a range or a spectrum is called the dispersion of white light.
Dispersion of White Light and How are colours produced
When a beam of white light enters a prism, it slows down and is refracted. The white light is then split into seven different visible colours of light. Which are red, orange, yellow, green, blue, indigo and violet. The seven different colours of light, which make up white light, slow down at different rates. In other words, the different colours of light are refracted or bent at different angles.
Point 2
How to get rainbow colours and to recombine it again
What is primary colours
What are the effects of mixing colours
As the refracted colours of light leave the prism, they are bent again, but not in their original paths. This is because the face of the prism through which the light leaves is not parallel to the face through which it enters.
To prove that white light is a mixture of different colours, another prism can be used to recombine the colours of its spectrum.
Another way of combining the different colours of spectrum is by spinning a rainbow-coloured disc called Newton’s disc.
Primary colours are green, red and blue; these three colours when mixed will form the white light.
Cyan, yellow and magenta are called secondary colours. They are produced by mixing any two of the three primary colours.
Cyan = blue + green
Yellow = red + green
Magenta = red + blue
Mixing all the three primary colours will give the white light
Red + blue + green = white
By using different brightness we can create all the colours of the rainbow and many other colours that go to make up our multicolored world.
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