College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 47

The angle of incidence of a light beam in air onto a reflecting surface is continuously variable. The reflected ray is found to be completely polarized when the angle of incidence is 48.0°. (a) What is the index of refraction of the reflecting material (b) If some of the incident light (at an angle of 48.0°) passes into the material below the surface, what is the angle of refraction