Answer
$-7.98cm$
Work Step by Step
We can find the focal length of the globe as
$f=-\frac{1}{2}R=-\frac{1}{4}D$
We plug in the known values to obtain:
$f=-\frac{1}{4}(31.9)=-7.98cm$
Physics Technology Update (4th Edition)
by Walker, James S.
Published by
Pearson
ISBN 10:
0-32190-308-0
ISBN 13:
978-0-32190-308-2
Chapter 26 - Geometrical Optics - Problems and Conceptual Exercises - Page 940: 19
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