Question

Why does white light split into seven colours when it passes through a prism?

Answer 1

This splitting of white light into constituent colours is caused due to the difference in the refractive index of different colour of lights, which constitute a white beam of light.

White light is made up of seven different coloured lights and all these lights have a different refractive index and when their medium of travelling is changed they tend to bend through it. Following the difference in refractive index, all colours bend at an angle different from the others.

The violet has a larger refractive index as compared to red therefore red appears as the sharpest colour and violet as the lightest colour.

Answer 2

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Why does white light split into seven colours when it passes through a prism?

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White light is made up of seven colours. Rays of different colours refract or bend along different paths and fall on different points on the wall forming a coloured pattern known as spectrum.