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

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SUMMARY

The focal length of the objective lens for a 10X telescope with a total length of 20 cm is approximately 18 cm. This conclusion is derived from the magnification formula M = -Fo/Fe, where M is the magnification, Fo is the focal length of the objective, and Fe is the focal length of the eyepiece. Given that the total length of the telescope is the sum of the focal lengths (L = Fo + Fe), the calculations confirm that the objective focal length must be around 18 cm to achieve the desired magnification.

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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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