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Chapter 5: Q17DQ (page 1151)
When a converging lens is immersed in water, does itsfocal length increase or decrease in comparison with the value inair? Explain.
When the lens in water focal length is increase.
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For the old “rabbit-ear” style TV antennas, it’s possible to alter the quality of reception considerably simply by changing the orientation of the antenna. Why?
Light scattered from the blue sky is strongly polarized because of the nature of the scattering process described in Section 33.6. But light scattered from white clouds is usually not polarized. Why not?
Could an experiment similar to Young’s two-slit experiment be performed with sound? How might this be carried out? Does it matter that sound waves are longitudinal and electromagnetic waves are transverse? Explain.
A spherical, concave shaving mirror has a radius of curvature of 32.0 cm. (a) What is the magnification of a person’s face when it is 12.0 cmto the left of the vertex of the mirror? (b) Where is the image? Is the image real or virtual? (c) Draw a principal-ray diagram showing the formation of the image.
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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