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Find Distance from Screen to Slits in Double Slit Experiment

  1. Feb 27, 2013 #1
    1. The problem statement, all variables and given/known data
    See attached image


    2. Relevant equations

    y=L*tan(theta)
    m*(lambda)=d*sin(theta)

    3. The attempt at a solution
    Lambda = 640 nm = 6.4x10^-4 mm

    m*(lambda)=d*sin(theta)

    1*(6.4x10^-4 mm) = (0.25 mm)*sin(theta)

    theta = 0.15 degrees

    y = L*tan(theta)

    This is where I am not sure. I know I need to plug in y and theta. But I think my y value is wrong. How can I know for sure what the distance between the maxima are? The graph that is given seems to be too poor to tell.
     

    Attached Files:

  2. jcsd
  3. Feb 27, 2013 #2

    Doc Al

    User Avatar

    Staff: Mentor

    The diagram seems clear enough to me. Hint: The distance of 2.0 cm seems to be exactly between which two maxima? (Don't think you need to use m = 1.)
     
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