College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 69

A beam of light both reflects and refracts at the surface between air and glass, as shown in Figure P22.25. If the index of refraction of the glass is n g , find the angle of incidence, 1 , in the air that would result in the reflected ray and the refracted ray being perpendicular to each other. Hint: Remember the identity sin (90° ) = cos .