24_Chapter 23 HomeworkCH23 Mirrors and Lenses

24_Chapter 23 HomeworkCH23 Mirrors and Lenses - 290 CHAPTER...

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290 CHAPTER 23 23.44 (a) We start with the final image and work backward. From Figure P22.44, observe that ( ) 2 50.0 cm 31.0 cm 19.0 cm q =− . The thin lens equation then gives ( )( ) 22 2 19.0 cm 20.0 cm 9.74 cm 19.0 cm 20.0 cm qf p == = + −− 9.74 cm 40.3 cm =−= The image formed by the first lens serves as the object for the second lens and is located 9.74 cm in front of the second lens. Thus, and the thin lens equation gives 1 50.0 cm q ( )( ) 11 40.3 cm 10.0 cm 40.3 cm 10.0 cm 1 13.3 cm p = + The original object should be located 13.3 cm in front of the first lens. (b) The overall magnification is ( ) 12 19.0 cm 40.3 cm 5.90 13.3 cm 9.74 cm qq MMM pp  = =   (c) Since 0 M < , the final image is inverted ; and since , it is 2 q 0 < virtual 23.45 Since the final image is to be real and in the film plane,
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This document was uploaded on 10/20/2011.

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