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Compound microscope focal length

  1. Apr 23, 2013 #1
    1. The problem statement, all variables and given/known data
    The barrel of a compound microscope is 15 cm in length (distance between lenses). The specimen will be mounted 1.0
    cm from the objective, and the eyepiece has a 5.0-cm focal length. Determine the focal length
    of the objective lens.
    Known: f2=5cm, L=15cm, do1=1cm
    Unknown: f1, di1, di2, do2

    2. Relevant equations

    3. The attempt at a solution
    A. I drew a diagram: I believe di1+do2=L
    B. I have the equations:

    I think there is some relation to distances that I'm not seeing.
  2. jcsd
  3. Apr 23, 2013 #2
    Must the intermediate image be formed at the focal point of the eyepiece? I think that could solve my distance dilemma.
  4. Apr 23, 2013 #3

    rude man

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    Homework Helper
    Gold Member

    Yes, and you should be able to explain why (hint: the normal human eye likes plane waves!).
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