Question

When white light goes through the prism, it splits into a spectrum. Why red rays refract less and purple rays most of all?

Answer 1

This is because after refraction from the 2nd surface of prism,angle of refraction `theta prop nu`,where `nu` is frequency of light wave.

Now,purple light has the higher frequency of visible light so it bends the most whereas red light has the least frequency and bending is the least.