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Homework Help: Building a microscope with two different power lenses

  1. Sep 21, 2012 #1
    1. The problem statement, all variables and given/known data

    You've been asked to build a 14X microscope from a 2X magnifying lens and a 5X magnifying lens.
    What will be the tube length of your microscope?

    2. Relevant equations

    Meye = 25/feye
    Mobj = -L/fobj
    M = (Meye)(Mobj)

    3. The attempt at a solution

    First, are you supposed to use the 5X as the objective? That's what I assumed since it's a higher power, but I'm not sure why exactly?

    Then I'm not quite sure what to do next. I found the feye value to be 12.5 cm. But I get don't know what to do after that. If someone could just point me in the right direction I'd appreciate it! Thanks!
  2. jcsd
  3. Sep 21, 2012 #2

    Simon Bridge

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    Science Advisor
    Homework Helper

    What difference does it make?
    Well you need to line up the lenses involved and work out what the magnification is for different 5x-2x separations. Do you know how to work out the combined magnification of two lenses?
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