A beam of light passes from air into a substance X. If the angle of incidence be `72^(@)` and the
Channel: Doubtnut
Date: 2020-01-28

A beam of light passes from air into a substance X. If the angle of incidence be `72^(@)` and the angle of refraction be `40^(@)`, calculate the refractive index of substance X. (Given: `sin72^(@)=0.951` and `sin40^(@)=0.642)`