A ray of light enters a right-angled triangular prism XYZ XYZ\,XYZ with a refractive index of 1.60, as shown in the diagram.
The face XY XY\,XY is horizontal and the face YZ YZ\,YZ is vertical. The base angle at X X\,X is 60∘60^\circ60∘. The light ray enters the face YZ YZ\,YZ perpendicularly and is incident on the inclined face XZXZXZ.
What is the angle of refraction when the ray exits face XZ XZ\,XZ into the air?
30.0∘30.0^\circ30.0∘
38.7∘38.7^\circ38.7∘
53.1∘53.1^\circ53.1∘
The ray undergoes total internal reflection at face XZXZXZ.