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Why do Michelson interferometer usually needs 2 mirrors?

  1. Mar 7, 2013 #1
    I've been wondering this for quite some time. Why do a typical set-up of Michelson interferometer usually requires 2 mirrors? Why not one for adjustment? Why not just shine the laser through the beam splitter?

    Thanks.
     
  2. jcsd
  3. Mar 9, 2013 #2

    Mech_Engineer

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  4. Mar 9, 2013 #3
    I meant the mirrors used to adjust the light source before the beamsplitter... Just like the set-up in this video by PHYWE (although I'm not using their equipment, but the set-up is almost identical)
     
    Last edited by a moderator: Sep 25, 2014
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