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.