Explanation Given info: The distance of the person from the concave mirror is 30.0 cm and the magnification is 1.50 times. The expression for magnification of the image is, m = − b a Here, a is the distance of the person from the mirror b is the distance of the image from the mirror. Rearrange the above equation for the value of b . b = − m a Substitute 30.0 cm for a and 1.50 for m in the above expression. b = − ( 1.50 ) ( 30.0 cm ) = − 45 cm The expression for the focal length of concave mirror is, 1 f = 1 a + 1 b Here, a is the distance of the object. b is the distance of the image. Rearrange the above equation for the value of f . f = a b a + b Substitute − 45

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ISBN: 8220100581557

Author: Jewett

Publisher: Cengage Learning US

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Chapter 36 Solutions

EBK PHYSICS FOR SCIENTISTS AND ENGINEER

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The focal length of the mirror.

Solution Summary: The author explains that the focal length of the concave mirror is 90.0cm.

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