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Two slit experiment question

  1. Jun 14, 2013 #1
    Hi all!

    I heard about that the experiment had been iplemented so the observation don't effect the experiment. Because some scientists thought that the observation has an effect on the experiment and that's why the interference pattern doesn't appear at that time. My question is, how they do that without the observer's effect?
  2. jcsd
  3. Jun 14, 2013 #2
    I heard that world would end in 2012........
    Please mention some references.
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