Question

what are the laws of refraction?
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Answer 1

Refraction is the change in direction of wave propagation due to a change in its transmission medium.

The phenomenon is explained by the conservation of energy and the conservation of momentum. Owing to the change of medium, the phase velocity of the wave is changed but its frequency remains constant.

Laws of Refraction

(1) The incident ray, the refracted ray and the normal to the surface at the point of incidence all lie in one plane.

(2) For any two given pair of media, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant.

i.e. sin i/ sin r = RI ( of second medium with respect to first)

Answer 2

Laws of refraction--

1) Snail's law- The value of sine of angle of incidence upon value of sine of angle of refraction is a constant quantity.

2) The incident ray, the refracted ray and the normal lie on the same plane at the point of incidence.