I have been working on this problem for HOURS PLease helpe me

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I have been working on this problem for HOURS! PLease helpe me!

Homework Statement


The objective of a telescope has a focal length of 200 cm and its eye piece has a focal length of 1 cm. What is the magnification of this telescope when viewing an object at infinity??


Homework Equations





The Attempt at a Solution



I thought ...
M = Fo/Fe which would = 200 but the answer is 20! Why? Does infinity have something to do with it??
 
on Phys.org
Anyone know about this??
 

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