College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 71

A light ray enters a rectangular block of plastic at an angle 1 = 45.0° and emerges at an angle 2 = 76.0°, as shown in Figure P22.57. (a) Determine the index of refraction of the plastic. (b) If the light ray enters the plastic at a point L = 50.0 cm from the bottom edge, how long does it take the light ray to travel through the plastic