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