Why do Michelson interferometer usually needs 2 mirrors?

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SUMMARY

A Michelson interferometer typically requires two mirrors to effectively recombine the light beams after passing through the beamsplitter. This configuration allows for precise adjustments of the light source before it reaches the beamsplitter, enhancing the accuracy of the interference pattern. The necessity of two mirrors is crucial for optimal performance in experiments, as demonstrated in various setups, including those similar to the PHYWE video referenced in the discussion.

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  • Understanding of optical interference principles
  • Familiarity with laser beam properties
  • Knowledge of beam splitters and their functions
  • Basic concepts of optical alignment techniques
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  • Research the design and operation of Michelson interferometers
  • Learn about laser beam alignment techniques
  • Explore the role of beam splitters in optical experiments
  • Investigate the impact of mirror adjustments on interference patterns
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Physics students, optical engineers, and researchers involved in experimental optics will benefit from this discussion, particularly those working with interferometry and laser applications.

Jerrynap
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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.
 
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You need two mirrors to recombine the beam after the beamsplitter.

http://en.wikipedia.org/wiki/Michelson_interferometer
300px-Michaelson_with_letters.jpg
 
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)
 
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