State the laws of refraction.

Explanation

(i) The incident ray, refracted ray and normal to the refracting surface are all coplanar.
(ii) The ratio of angle of incident i in the first medium to the angle of refraction r in the second medium n, to that of the refractive index of the first medium `n_(1)`.
`(sini)/(sinr) = n_(2)/n_(1)`