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Homework Help: Optics Problems

  1. Apr 22, 2004 #1
    Can anyone explain the following to me;

    what is phase difference and coherence?

    what actually is diffraction and why does it happen (is it something to do with Huygens principle?)

    why do you observe circular fringes when using the Michelson interferometer

    your help is much appreciated, thanks
  2. jcsd
  3. Apr 23, 2004 #2
    Can anyone help with just one of these then?
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