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N-source versus N-slit interference

  1. Jun 24, 2006 #1
    Hi all,

    I don't understand why the intensity pattern for an arbitrary number of slits will decay with distance from the centre of the screen, whereas the intensity pattern due to N-point sources will vary periodically with no average decay. I can derive the electric field and intensity for both cases to show it is true, but I can't justify it physically. Any hints would be appreciated.

    Thanks

    James
     
  2. jcsd
  3. Jun 25, 2006 #2
    I should also have mentioned that I'm working in the Fraunhofer regime.
     
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