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Photons and Angular Momentum

  1. Dec 18, 2014 #1
    Do photons obey the conservation law of angular momentum?
     
  2. jcsd
  3. Dec 18, 2014 #2

    mfb

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    There is no conservation law for single particles.
    Processes with photons (and, in fact, all processes without external forces) conserve angular momentum.
     
  4. Dec 18, 2014 #3
    Thank you for the straight forward answer. What would constitute a process of photons?
     
  5. Dec 18, 2014 #4

    mfb

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    Every physical system where photons are involved.

    Edit: Fixed weird typo
     
    Last edited: Dec 19, 2014
  6. Dec 18, 2014 #5
    refraction for example, wave interference also.
     
  7. Dec 18, 2014 #6

    Andy Resnick

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    Photons are circularly polarized ('helicity') to conserve angular momentum (Δl = ±1)
     
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