Answer
$24cm$
Work Step by Step
We know that
$f_{objective}=M_{total}f_{eyepiece}$
We plug in the known values to obtain:
$f_{objective}=22(1.1)=24.2cm=24cm$
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 27 - Optical Instruments - Problems and Conceptual Exercises - Page 972: 71
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