University Physics with Modern Physics (14th Edition)

Published by Pearson
ISBN 10: 0321973615
ISBN 13: 978-0-32197-361-0

Chapter 34 - Geometric Optics - Problems - Exercises - Page 1158: 34.111

Answer

Choice B.

Work Step by Step

Apply the thin-lens formula. The lens power in diopters is 1/f (when f is measured in m). $$\frac{1}{s}+\frac{1}{s’}=\frac{1}{f}$$ Here, D is negative, s is positive, and s’ is negative. A larger power |D| means that s’ decreases in magnitude. The shorter focal length, –15-diopter lens creates an image that is a shorter distance from the frog’s eye, compared to the –9-diopter lens.
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