State and explain the laws of refraction of light. Define refractive index.

Question

Accepted Answer

The laws of refraction of light are: 1) The incident ray, the normal at the point of incidence, and the refracted ray all lie in the same plane. 2) The ratio of the sine of the angle of incidence to the sine of the angle of refraction is constant for a given pair of media — this is Snell's Law: sin i / sin r = μ (a constant).