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Homework Help: Question regarding a double slit experiment

  1. May 3, 2013 #1
    1. The problem statement, all variables and given/known data

    The question is as follows, I'm truly stuck where to start here, any help would be much appreciated:

    A transparent paper of refractive index 1.45 and thickness 0.02mm is pasted on one of the slits of a double slit experiment. Monochromatic light of wavelength 620nm is passed through the slits. How many fringes will cross through the centre if the paper is removed?

    2. Relevant equations

    I have been provided with one equation for this, which is as follows:


    Where n is the refractive index and t is the thickness.

    3. The attempt at a solution

    Truly stuck where to even begin I'm sorry to say.
  2. jcsd
  3. May 3, 2013 #2


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    What are β and Yo in this equation? (I take it that λ is wavelength.)
  4. May 3, 2013 #3
    From what I am aware, β is the fringe width and I'm truly not sure what Yo even is, possibly the width of intensity?
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