Question

plz define the snells law of refraction ?

Answer 1

Snell's Law of refraction states that the ratio of the sines of the angles of incidence and refraction of a wave are constant when it passes between two given media.

$\frac{sin_i}{sin_r}$ = constant

Answer 2

Snell's law states that "the ratio of sine of angle of incidence to the sine of angle of reflection for light of given colour is constant for a given pair of media."

            sin i / sin r = constant