Answer
(b) a shorter focal length
Work Step by Step
The magnification of compound microscope is given by $-\frac{f_{o}}{f_{e}}$. Thus to form magnified image the eye piece should have shorter focal length.
College Physics (7th Edition)
by Wilson, Jerry D.; Buffa, Anthony J.; Lou, Bo
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: 7
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