Chapter 5: Q7DQ (page 1151)
When a room has mirrors on two opposite walls, an infinite series of reflections can be seen. Discuss this phenomenon in terms of images. Why do the distant images appear fainter?
Distant images appear fainter because each image acts as an object for the other mirror and so on.
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Some loudspeaker horns for outdoor concerts (at which the entire audience is seated on the ground) are wider vertically than horizontally. Use diffraction ideas to explain why this is more efficient at spreading the sound uniformly over the audience than either a square speaker horn or a horn that is wider horizontally than vertically. Would this still be the case if the audience were seated at different elevations, as in an amphitheater? Why or why not?
Why is a diffraction grating better than a two-slit setup for measuring wavelengths of light?
A fellow student, who values memorizing equations above understanding them, combines Eq. (35.4) and (35.13) to “prove” that can only equal localid="1663905625404" . How would you explain to this student that can have values other than localid="1663906387916" ?
What is the difference between Fresnel and Fraunhofer diffraction? Are they different physical processes? Explain.
For a spherical mirror, if s = f , then s' = , and the lateral magnification m is infinite. Does this make sense? If so, what does it mean?
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