Answer
$f=20cm$
Work Step by Step
According to Table 34-4 and 17b, the focal length is 20cm.
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 34 - Images - Problems - Page 1039: 17b
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