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**Test TOMORROW PLEASE HELP ME! Telescope!!!**

**1. 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?

**2. Homework Equations**

**3. 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???