Test TOMORROW PLEASE HELP ME! Telescope!!! 1. The problem statement, all variables and given/known data 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. Relevant 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???