In the gure, a light ray in air is incident on a at layer of material 2 that has an index of refraction n2 = 40. Beneath material 2 is material 3 with an index of refraction mg. The ray is incident on the airmaterial 2 interface at the Brewster angle for that interface. The ray of light refracted into material 3 happens to be incident on the material 2material 3 interface at the Brewster angle for that interface. What is the value ofng? Number n Units V