Fundamentals of Physics Extended (10th Edition)

Published by Wiley
ISBN 10: 1-11823-072-8
ISBN 13: 978-1-11823-072-5

Chapter 34 - Images - Problems - Page 1039: 21a

Answer

Concave.

Work Step by Step

A mirror that has a positive focal length is concave. The focal length $f=20cm$ is positive, therefore, the mirror is concave.
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