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Fresnal's biprism formula for d

  1. Aug 19, 2011 #1
    1. The problem statement, all variables and given/known data

    Show that the seperation of the two coherent sources is given by d=2aA(n-1) where n is the refactive index of prism.

    2. Relevant equations

    from youngs double slit experiment y=Rm[itex]\lambda[/itex]/d

    3. The attempt at a solution

    i have no idea how to derive this formula. ive seen it many times before but nowhere shows the derivation. i can see youngs experiment is similar, but fail to see a connection?


    there should be a picture attached to this post. hopefully!

    Attached Files:

  2. jcsd
  3. Aug 20, 2011 #2


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    Last edited by a moderator: Apr 26, 2017
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