Homework # 11 - Total Internal Reflection Handout Problems: 1. Why does total internal reflection only occur when passing from a higher refractive index to one of lower refractive index? 2. What happens to a light ray entering a boundary at an angle with respect to the normal greater that the critical angle? Smaller than the critical angle? At the critical angle? 3. Using a diagram and a brief paragraph explain what a fiber optic cable is, what it's used for and how it works. 4. Find the critical angle for light rays passing from (a) corn oil into air; (b) from flint glass into water