1. An underwater diver looking up at an angle of 45 degrees at the surface of still water can see the horizon. What would the diver see if she looked up at the water surface at an angle of 60 degrees?
2. For a person to be perfectly invisible, what must his or her index of refraction be? Explain why you have chosen this value for your answer?
3. Fused quartz and oleic acid both have an index of refraction of 1.46. What would you expect to see if a piece of fused quartz was placed in a container of transparent liquid oleic acid?
4. An optical fiber consists of cylindrical tube of glass with a refractive index of 1.6 surrounded by air.
4.1 What is the critical angle at the glass-air interface?
4.2 Explain how a ray of light passes from one end of the optical fiber to the other?