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Homework Help: Test TOMORROW PLEASE HELP ME! Telescope

  1. Apr 2, 2008 #1
    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???
  2. jcsd
  3. Apr 2, 2008 #2
    I got it nevermind.
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