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Backscattering of light at a black hole

  1. Aug 3, 2008 #1
    In my book it states that if you shine a laser beam on a black hole some of the light is backscattered; so that way you can detect black holes; why is that?

    Is it because of diffraction or is it because of quantum mechanical effects?
     
  2. jcsd
  3. Aug 3, 2008 #2

    George Jones

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    What book?

    If you send light in just the right direction, it will loop once around the black hole and come back to your eye/detector. If you send light in just the right direction, it will loop twice around the black hole and come back to your eye/detector. If you send light in just the right direction, it will loop three times around the black hole and come back to your eye/detector. ...

    I'm not sure about the feasibility of using this as a method for detecting black holes.
     
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