Explanation Given data: f 1 = 50 mm . h 1 = 1.2 mm . f 2 = 300 mm . I 1 = 2.5 W m 2 . Formula used: The ratio of height of image made by lens is given by, h 2 h 1 = f 2 f 1 (1) Here, h 2 is the height of second lens, h 1 is the height of first lens, f 2 is the focal length of second lens, and f 1 is the focal length of first lens. The ratio of intensity is given by, I 1 I 2 = ( f 2 f 1 ) 2 (2) Here, I 2 is the intensity of second lens and I 1 is the intensity of first lens. Substitute 50 mm for f 1 , 300 mm for f 2 , and 1.2 mm for h 1 in equation (1), h 2 1 .2 mm = 300 mm 50 mm h 2 = 300 mm 50 mm × 1 .2 mm h 2 =7

College Physics: A Strategic Approach (3rd Edition)

3rd Edition

ISBN: 9780321879721

Author: Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field

Publisher: PEARSON

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Chapter P.5, Problem 17P

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