College Physics (7th Edition)

Published by Pearson
ISBN 10: 0-32160-183-1
ISBN 13: 978-0-32160-183-4

Chapter 25 - Vision and Optical Instruments - Learning Path Questions and Exercises - Multiple Choice Questions - Page 870: 8


(c) an objective of relatively long focal length

Work Step by Step

An astronomical telescope has an objective lens and eyepiece lens and its magnification is $-\frac{f_{o}}{f_{e}}$. So to have magnification magnitude greater than 1, the focal length of objective should be longer.
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