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Chapter 33: Q7Q (page 1000)
Figure 33-30 shows rays of monochromatic light propagating through three materials a, b, and c. Rank the materials according to the index of refraction, greatest first.
The ranking of materials according to the index of refraction is
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In Fig. 33-77, an albatross glides at aconstant horizontallyabove level ground, moving in a vertical plane that contains the Sun. It glides toward a wallof height, which it will just barely clear. At that time of day, the angle of the Sun relative to the groundis.At what speed does the shadow of the albatross move (a) across the level ground and then (b) up the wall? Suppose that later a hawk happens to glide along the same path, alsoat.You see that when its shadow reaches the wall, the speed of the shadow noticeably increases. (c) Is the Sun now higher or lower in the sky than when the albatross flew by earlier? (d) If the speed of the hawk’s shadow on the wallis,what is the angle u of the Sun just then?
Question: In Fig. 33-62, a light ray in air is incident at angle on a block of transparent plastic with an index of refraction of. The dimensions indicated are and. The light passes through the block to one of its sides and there undergoes reflection (inside the block) and possibly refraction (out into the air). This is the point offirst reflection. The reflected light then passes through the block to another of its sides — a point ofsecond reflection. If , on which side is the point of (a) first reflection and (b) second reflection? If there is refraction at the point of (c) first reflection, and (d) second reflection, give the angle of refraction; if not, answer “none”. If , on which side is the point of (e) first reflection and (f) second reflection? If there is refraction at the point of (g) first reflection, and (h) second reflection, give the angle of refraction; if not, answer “none”.
Assume (unrealistically) that a TV station acts as a point source broadcasting isotopically at . What is the intensity of the transmitted signal reaching Proxima Centauri, the star nearest our solar system,away? (An alien civilization at that distance might be able to watchXFiles.) A light-year () is the distance light travels in one year.
In Fig.33-52a, a beam of light in material1is incident on a boundary at an angle of. The extent of refraction of the light into material2depends, in part, on the index of refractionof material 2. Fig.33-52bgives the angle of refractionversusfor a range of possiblevalues. The vertical axis scale is set byand
(a) What is the index of refraction of material 1?
(b) If the incident angle is changed toand material 2has , then what is angle ?
In Fig. 33-75, unpolarized light is sent into a system of three polarizing sheets, where the polarizing directions of the first and second sheets are atanglesand. What fraction of the initial light intensity emerges from the system?
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