Ch 33 Relevant Concept Questions

# Ch 33 Relevant Concept Questions - 2 You are standing on...

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University Physics Young and Freedman Chapter 33 Concept Questions and solutions Chapter 33: Pre-Chapter Question Q:What causes the second, faint rainbow outside the primary one? Why are its colors in the reverse sequence from the primary rainbow? A: The secondary rainbow is caused by light rays that reflect twice inside a raindrop before exiting the drop. The light rays flip over in the 2 nd reflection, reversing the color sequence. 1. Some crystals are not isotropic: light travels through the crystal at a higher speed in some directions than in others. In a crystal in which light travels at the same speed in the x- and z-directions but at a faster speed in the y-direction, would the wave fronts in Fig. 33.3 still be spherical? If not, what would they look like? No, since the waves do not propagate at equal speed in all directions. The waves go farther in the y-direction in a given amount of time than other directions, so the wave fronts are elongated in the y-direction.
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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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