Unformatted text preview: 2. You are standing on the shore of a lake. You spot a tasty fish swimming some distance below the lake surface If you want to spear the fish, should you aim the spear above, below, or directly at the apparent position of the fish? Where should you aim if instead you use a high-power laser to simultaneously kill and cook the fish? The fish appears higher, so aim lower in the first case. As for the laser, however, because it is light, it will follow the refraction and hit the fish if you aim at it. 3. Consider light propagating in an optical fiber. Why doesn't the light undergo total internal reflection when it reaches the end of the fiber, preventing it from getting out? The light strikes the end surface of the fiber at a small angle to the normal, as Fig. 33.14 shows. Hence total internal reflection, which requires a large angle of incidence (greater than the critical angle), cannot occur, and the light is able to escape the fiber....
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- Spring '07
- Physics, Snell's Law, Total internal reflection, University Physics Young