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Homework Help: Focal length

  1. Jul 18, 2005 #1
    Can someone tell me what sort of equation I would use for this question, I can't use the magnification as I have two unknowns. At least I don't know how to apply the magnification equation to this question.

    A microscope is made in a tube 25.0cm long. It magnifies 5.00 x 10 to the 2 times, 50.0 times by the objective lens and 10 times by the eyepiece. What is the focal length of the two lenses?
  2. jcsd
  3. Jul 18, 2005 #2


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  4. Jul 31, 2005 #3
    What do you need to get greater magnification, a wider objective lens? :bugeye:
  5. Jul 31, 2005 #4
    magnification is given by the eq. M = -q / p

    see if that helps
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