Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)

Published by Pearson
ISBN 10: 0133942651
ISBN 13: 978-0-13394-265-1

Chapter 35 - Optical Instruments - Exercises and Problems - Page 1017: 15


The focal length objective is $~~2.0~mm$

Work Step by Step

We can find the focal length objective: $M = -\frac{L}{f_{obj}}\cdot \frac{25~cm}{f_{eye}}$ $f_{obj} = -\frac{L}{M}\cdot \frac{25~cm}{f_{eye}}$ $f_{obj} = -\frac{20~cm}{-500}\cdot \frac{25~cm}{5.0~cm}$ $f_{obj} = 0.20~cm$ $f_{obj} = 2.0~mm$ The focal length objective is $~~2.0~mm$
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