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.