What is the approximate focal length for a 10X telescope with a 20 cm length?

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To determine the focal length of a 10X telescope with a length of 20 cm, the magnification formula M = -Fo/Fe is relevant. Given the magnification (M) is 10X, the relationship between the focal lengths of the objective (Fo) and the eyepiece (Fe) is crucial. The total length of the telescope (L) is the sum of the focal lengths, so L = Fo + Fe. With L set at 20 cm, the focal length of the objective can be approximated by rearranging the equations, leading to Fo being around 18 cm when considering typical values for Fe. Understanding these relationships is key for solving telescope design problems.
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Test TOMORROW PLEASE HELP ME! Telescope!

Homework Statement


I need serious help! I have a test tomorrow and I am having trouble with microscope/telescope questions...

A person is designing a 10X telescope is limited to a length of 20 cm, what is the approximate focal length of the objective?


Homework Equations





The Attempt at a Solution


M = 10X
L = 20 cm
Fo = ?

The equation I found for a telescope is M = -Fo/Fe and the rest of the equations involve theta which I don't have. And I don't have Fe?
 
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I got it nevermind.
 
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