Answer
(d) at infinity
Work Step by Step
If an object is placed at focal point of lens the rays after reflecting will become parallel to each other. So the image will form at 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: 9
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