Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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

  1. Aug 18, 2015 #1


    User Avatar

    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?
    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


    User Avatar
    2017 Award

    Staff: Mentor

    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.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook