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Question about Michelson-Morley interferometer

  1. Dec 19, 2015 #1
    Must the two arms of a MM interferometer be equal for fringes to appear? What is the tolerance on that? Would that give the length of the wave packets?
  2. jcsd
  3. Dec 19, 2015 #2


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    The tolerance is given by the spatial longitudinal extent of the wavepacket.
  4. Dec 19, 2015 #3


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    Staff: Mentor

    A relevant quantity is the coherence length of the light.
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