Question

State the reason of deviation of constituent colours of light at different angles when white light passes through a glass prism 0

Answer 1

This is because of DISPERSION of light.

Dispersion- It takes place because the refractive index of the refracting medium is different for different colours or wavelengths.

Refractive index= a+b/wavelength2+c/wavelength4

So Deviation = (refractive index-1) ^ Angle of prism.

White light is made up of seven colours of different wavelengths , hence different colours emerge in different directions