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
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