Question

Explain the phenomenon of refraction through prism. Derive relation between refractive index and minimum deviation.

Answer 1

the white light fall on the prism while light split into seven color

Answer 2

The phenomenon of refraction through prism 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 can be used to separate a beam of white light into its constituent spectrum of colors.

Light is deflected as it enters a material with refractive index > 1.
A ray of light is deflected twice in a prism. The sum of these deflections is the deviation angle. When the entrance and exit angles are equal, the deviation angle of a ray passing through a prism will be a minimum.