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How does a light gate work?

  1. Dec 20, 2014 #1
    I'm looking for an explanation for my physics investigation

    thanks in advance ;D
     
  2. jcsd
  3. Dec 20, 2014 #2

    phinds

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    Gold Member
    2016 Award

    Uh ... WHAT investigation? Have you done ANY research? I did a quick Google and got some decent explanations.
     
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