Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 25 - Optical Instruments - Problems - Page 741: 32

Answer

92 cm

Work Step by Step

Use equation 25-3 to find the magnification of the telescope. $$M=-\frac{f_o}{f_e}$$ $$f_e=-\frac{f_o}{M}=-\frac{88cm}{-25}\approx 3.5cm$$ See Figure 25-20. When the object and the image are both far away, the separation of the 2 lenses is the sum of their focal lengths. $$L=f_o+f_e=88cm+3.52cm\approx 92cm$$
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