EXAMPLE - REVIEW (D) Ө Ania shines a laser on her mirror, starting from a point located 1.70 cm above the round. The laser light hits the mirror at 25 cm above the ground. How far away from the mirror 2.0 m does the reflection appear on the floor? h d

A flat minor is neither converging nor diverging. To prove this, consider two rays originating from the same point and diverging at an angle . Show that after striking a plane mirror, the angle between their directions remains . Figure 25.52 A flat mirror neither converges nor diverges light rays. Two rays continue to diverge at the same angle after reflection.

Construct Your Own Problem Consider sunlight entering the Earth’s atmosphere at sunrise and sunsetthat is, at a 90° incident angle. Taking the boundary between nearly empty space and the atmosphere to be sudden, calculate the angle of refraction for sunlight. This lengthens the time the Sun appears to be above the horizon, both at sunrise and sunset. Now construct a problem in which you determine the angle of refraction (or different models 01 the atmosphere, such as various layers of varying density. Your instructor may wish to guide you on the level of complexity to consider and on how the index at retraction varies with air density.

A fish is 3.25 m below the surface of still water (Fig. P38.16). You do not want the fish to see your fishing boat. Is it possible to place your boat so that total internal reflection keeps it hidden from the fish? If so, explain how this is done. If not, explain why not. FIGURE P38.16 Problems 16 and 17.