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Homework Help: Telescope problem

  1. Feb 23, 2009 #1
    1. The problem statement, all variables and given/known data

    Your telescope has a 700 mm focal-length objective and a 28 mm focal-length eyepiece.
    a) What angle (in degrees) does the image of the moon subtend, when you look at it through your telescope?
    b) Suppose you decide to take a photograph of the moon using your telescope. You position film so that it captures the image produced by the objective lens. What is the diameter of that image?

    2. Relevant equations

    3. The attempt at a solution

    i got the first part right. my ans is 13 degree. but how i do b)?
  2. jcsd
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