Answer
(b) infinity
Work Step by Step
The focal length is the distance of point where parallel rays converge after hitting a plane surface. Since rays after hitting glass block remains parallel its focal length is infinity.
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: 13
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