Question

what is refractive index and Dispersion of light​

Answer 1

sin i/ sin r is refractive index

the splitting of white light by a prism into its constituent colours is called dispersion

Answer 2

HEY MATE HERE IS YOUR ANSWER

REFRACTIVE INDEX:-the ratio of the speed of radiation (such as light) in one medium (such as air, glass, or a vacuum) to that in another medium.

DISPERSION OF LIGHT:-Visible light is actually made up of different colors. Each color bends by a different amount when refracted by glass. That's why visible light is split, or dispersed, into different colors when it passes through a lens or prism.