Question

what is refractive index?

Answer 1

it is the natural property of the material through which light ray changes it's path

Answer 2

here is ur answer..... refractive index is the ratio between sin of angle of incidence and sin of angle of refraction.....which is equal to refractive index in a given pair of media.....
THIS LAW IS ALSO KNOW AS SNELL's LAW.....HOPE THIS HELPS...