Question

what is refraction and prism

Answer 1

A prism is a clear, triangular device made up of plastic or glass (or any transparent material). When white light goes through a prism, the light bends due to the phenomenon called refraction. Refraction is the process of bending light as light goes from one medium (like air) to another medium (like water or glass).
hope it will help

Answer 2

the changing in the wave length of the light due to changing in the speed of light.
prism=prism is in the triangular shape and transparent mediam.