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Homework Help: Movable mirror of a Michelson interferometer

  1. Jan 5, 2010 #1
    i know the question may be a bit stupid to some people, but i seriously don't know how to do it....
    1. The problem statement, all variables and given/known data
    How far must the movable mirror of a Michelson interferometer, illuminated by a 589-nm source, be displaces for 2000 fringes to move past the reference point?


    2. Relevant equations

    i have no idea

    3. The attempt at a solution

    i don't know how to solve it
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Jan 5, 2010 #2

    ideasrule

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    Homework Helper

    Re: interferometer

    What's the path length difference associated with 2000 fringes?
     
  4. Jan 6, 2010 #3
    Re: interferometer

    it does not say, that was the whole question.
     
  5. Jan 6, 2010 #4

    ideasrule

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    Homework Helper

    Re: interferometer

    Yes, but it does tell you the wavelength, and constructive interference occurs when the path length difference is an integer multiple of the wavelength.
     
  6. Feb 22, 2010 #5
    Re: interferometer

    can anyone answer this question
    In Sagnac interferometer replace the beam splitter by a fourth mirror and calculate how many loops around the interferometer can the light make before its intensity is reduced by 99%??
     
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