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Two slit experiment question

  1. Dec 30, 2012 #1
    In the two slit experiment when which path information is present there is no wave interference pattern such as would be seen with both slits being used. When a single slit is used there is a visible diffraction pattern. Is such a pattern seen when a detector forces a one slit path in the two slit experiment ?
  2. jcsd
  3. Dec 30, 2012 #2


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    With "which path information", you'll still see single-slit interference patterns if the measurement does not measure additional information about the precise position of the particle in the slit.
  4. Dec 30, 2012 #3
    to add to what mfb has already said...

    the degree of diffraction/interference is inversely proportional to the degree of precision/probability (of particle/photon location).

    its not a yes or no, 1 or 0, interference or no-interference, which-way or no-which-way thing
    Last edited: Dec 30, 2012
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