1013_Physics ProblemsTechnical Physics

1013_Physics ProblemsTechnical Physics - 354 Image...

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354 Image Formation P36.9 (a) 11 2 pqR += gives 1 30 0 12 40 0 .. cm cm q af 40 0 1 30 0 00833 1 q =− . cm cm cm so q 12 0 . cm M q p = = 12 0 30 0 0400 . . . cm cm a f . (b) gives 1 60 0 40 0 cm cm q 40 0 1 60 0 00666 1 q . cm cm cm so q 15 0 M q p = = 15 0 60 0 0250 . . . cm cm a f . (c) Since M > 0 , the images are upright . P36.10 With radius 2.50 m, the cylindrical wall is a highly efficient mirror for sound, with focal length f R == 2 125 m . In a vertical plane the sound disperses as usual, but that radiated in a horizontal plane is concentrated in a sound image at distance q from the back of the niche, where 111 pq f so 1 200 11 m m q q = 333 m . P36.11 (a) becomes 60 0 1 90 0 q cm cm q = 45 0 and M q p = = −
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