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 - General Problems - Page 742: 75

Answer

a. -2.8x b. The 5.5D lens

Work Step by Step

a, b. Use equation 25-3 to find the magnification of the telescope. The powers are the reciprocals of the focal lengths. $$M=-\frac{f_o}{f_e}=-\frac{P_e}{P_o}$$ To obtain a magnification greater than 1, the higher power lens (5.5D) should be the eyepiece. $$M=-\frac{5.5D}{2.0D}=-2.75\approx-2.8$$
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