Answer
$2.8m$
Work Step by Step
We know that
$f_{objective}=M_{total}f_{eyepiece}$
We plug in the known values to obtain:
$f_{objective}=55(0.05m)=2.75m$
We can find the length of the telescope as
$f_{objective}=2.75+0.05=2.8m$
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: 69
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