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Homework Help: Youngs Double-Slit Experiment

  1. Feb 29, 2012 #1
    1. The problem statement, all variables and given/known data

    In a Young's double-slit experiment, two rays of monochromatic light emerge from the slits and meet at a point on a distant screen, as in the figure below. The point on the screen where these two rays meet is the eighth-order bright fringe. The difference in the distances that the two rays travel is 3.22 10-6 m. What is the wavelength of the monochromatic light?



    2. Relevant equations

    sinθ = mλ/d

    3. The attempt at a solution

    well i derived the equation
    sinθ*d/m = λ

    I'm pretty sure I can figure it out once I get the θ, but I have absolutely no idea how to solve for it in this case.

    I'm also not sure if you need y=L*tanθ

    any help is appreciated
  2. jcsd
  3. Feb 29, 2012 #2
    In the double slit experiment Maxima occur when the path difference between the 2 sources = nλ
    That should be all you need !!
  4. Feb 29, 2012 #3
    i dont understand, do u mean

    3.22x10^-6/8 = λ
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