Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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?

  2. jcsd
  3. Mar 9, 2013 #2


    User Avatar
    Science Advisor
    Gold Member

  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
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook