Question

State the laws of refraction.What is the meaning of " the refractive index of crown glass is 1.52"?

Answer 1

The laws of refraction are:

1. The incident ray, the normal and the refracted ray all lie on the same plane at the point of incidence.
2. The ratio of the sine if angle of incidence to the sine of angle of refraction is constant for a given pair of media. (Snell's law)

The statemnt "the refractive index of crwon glass is 1.52" means that light travles in air 1.52 times faster than it does in crown glass.

Answer 2

Refractive index, also called index ofrefraction, measure of the bending of a ray of light when passing from one medium into another. ... Refractive index is also equal to the velocity of light c of a given wavelength in empty space divided by its velocity v in a substance, or n = c/v.