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No interference pattern in double slit when there is a lens?

  1. Aug 18, 2015 #1

    Nav

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    Why does the interference pattern of the photon go away when one places a convex lens far away from the two slit to only show a particle build up of the two slits?
    upload_2015-8-18_11-38-2.png
    This is the experimental set up, the lens is in place far after the photons pass through the two slit and hit the back wall in a particle distribution of the two slit, not a wave. Why does this happen?
     
  2. jcsd
  3. Aug 18, 2015 #2

    mfb

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    Tthe idea of wave-particle duality just leads to more confusion than clarity here.

    Check the phase differences for each point on the screen, and you see why the interference (and even single-slit patterns) disappears.
     
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