For a given pair of media, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant. This constant is called as refractive index.
If ‘i’ is the angle of incidence and ‘r’ is the angle of refraction then,
sin i/sin r = Constant.
If ‘i’ is the angle of incidence and ‘r’ is the angle of refraction then,
sin i/sin r = Constant.
