Walker, Halliday & Resnick — Electromagnetic Waves: Problem 62

62 In Fig. 33-52, a light ray in air is incident on a flat layer of material 2 that has an index of refraction \(n_2 = 1.7\). Beneath material 2 is material 3 with an index of refraction \(n_3\). The ray is incident on the air–material 2 interface at the Brewster angle for that interface. The ray of light refracted into material 2 happens to be incident on the material 2–material 3 interface at the Brewster angle for that interface. What is the value of \(n_3\)?