Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (3rd Edition)

Published by Pearson
ISBN 10: 0321740904
ISBN 13: 978-0-32174-090-8

Chapter 24 - Optical Instruments - Exercises and Problems - Page 713: 17

Answer

The focal length of the eyepiece should be $~~5.0~cm$

Work Step by Step

We can find the required focal length of the eyepiece: $M = -\frac{L}{f_o}\cdot \frac{25~cm}{f_e}$ $f_e = -\frac{L}{f_o}\cdot \frac{25~cm}{M}$ $f_e = \frac{160~mm}{8.0~mm}\cdot \frac{25~cm}{100}$ $f_e = 5.0~cm$ The focal length of the eyepiece should be $~~5.0~cm$
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