Answer
(b) decrease
Work Step by Step
As the focal length increases according to formula $P=\frac{1}{f}$, power of lens decreases.
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 23 - Mirrors and Lenses - Learning Path Questions and Exercises - Multiple Choice Questions - Page 804: 16
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