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