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Multiple-Slit Interference

  1. Feb 25, 2009 #1
    1. The problem statement, all variables and given/known data

    "If the distance between the centers of adjacent slits in the five-slit mask is 125[lambda], determine the angle (measured relative to the normal to the screen) to the minimum closest to the center of the screen."

    2. Relevant equations
    So, I have a question about the homework due tomorrow.
    Here is the question:

    So, do I use dsin[theta] = m[lambda]?
    Where d would be, well, I am not sure,
    Theta is what I'd be solving for,
    m would be 0.5 (I think, but not sure since there are 5 slits)
    and lambda would be 125

    Is this right, or totally wrong?
     
  2. jcsd
  3. Feb 25, 2009 #2

    Delphi51

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    Homework Helper

    Correct formula. "d" is the distance between slits, so replace it with 125*L
    (I'm writing L instead of lambda). That gives you
    125*L*sin(A) = m*L
    For the first minimum, m = 1/2.
    The L cancels, so you can find A.
     
  4. Feb 25, 2009 #3
    Okay, so theta = 0.23 degrees?
     
  5. Feb 25, 2009 #4

    Delphi51

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    Homework Helper

    Yes, that's it.
     
  6. Feb 25, 2009 #5
    Awesome! Thanks :D
     
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