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Chapter 5: Q6DQ (page 1151)
For what range of object positions does a concave spherical mirror form a real image? What about a convex spherical mirror?
No, real image never forms any real image of objects
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For the situation shown in Fig. 34.3, is the image distance s′ positive or negative? Is the image real or virtual? Explain your answers
Explain why the focal length of a plane mirror is infinite, and explain what it means for the focal point to be at infinity.
You may have noticed a small convex mirror next to your bank’s ATM. Why is this mirror convex, as opposed to flat or concave? What considerations determine its radius of curvature?
The two sourcesshown in Fig. 35.3 emit waves of the same wavelength and are in phase with each other. Suppose is a weaker source, so that the waves emitted by have half the amplitude of the waves emitted by . How would this affect the positions of the antipodallines and nodal lines? Would there be total reinforcement at points on the antipodal curves? Would there be total cancellation at points on the nodal curves? Explain your answers.
A student claimed that, because of atmospheric refraction (see Discussion Question Q33.2), the sun can be seen after it has set and that the day is therefore longer than it would be if the earth had no atmosphere. First, what does she mean by saying that the sun can be seen after it has set? Second, comment on the validity of her conclusion.
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