Question

(i) State Brewster's law.
(ii) Find Brewster's angle for a transparent liquid having refractive index 1·5.

Answer 1

(i) Brewster's law states that at polarization, angle of incidence reflected and refracted rays are at a right angle to each other.

(ii)          `mu` = tan ip                   where ip = Brewster;s angle 

∴      tan ip = 1 - 5

∴            ip = tan^-1 1.5

               ip = 56.3°