Question

How does the refraction takes place in prism?

Answer 1

This phenomenon is called dispersion. This causes light of different colors to be refracted differently and to leave the prism at different angles, creating an effect similar to a rainbow. This canbe used to separate a beam of white light into its constituent spectrum of colors.

Answer 2

the refractive index of the prism is greater than the surrounding medium air. when the white light enters into prism the wavelength of different colors changes and red deviates less as it have more wavelength and in case of violet vice versa