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Weird Superposition Question

  1. Nov 10, 2005 #1
    Hello! I'm new here, and this is my first post. I hope I have not breached any rules, but here's a rather strange (in my limited intelligence) question I encountered. I shall try to explain the question because I am unable to reproduce the diagram.

    Two identical narrow slits S1 and S2 are illuminated by light of wavelength (lambda) from a point source P.

    [diagram = So, P (on the left) is connected to the line marked S1 and S2 by two lines l1 and l2. l1 is longer than l2. A point Q on the right of the line S1S2 is connected to S1 by l3 and S2 by l4, l3being longer than l4]

    The light is allowed to fall on a screen (at Q), and if m is a positive integer, the condition for destructive interference at Q is that...

    Thanks for the help!

    EDIT: Crap, I just realised this is in the wrong thread... I really apologise for bungling up my first post and the inconvenience I have caused.
     
    Last edited: Nov 10, 2005
  2. jcsd
  3. Nov 10, 2005 #2
    Show us what you have tried already. Remember, for destructive interference the path difference must be equal to 1/2 or 3/2 or 5/2 or 7/2 etc wavelengths.
     
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