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What is the difference between normal modes and propagation modes?

  1. Nov 16, 2011 #1
    What is the difference between normal modes and propagation modes?

    I am confused. I know that normal modes are natural modes of vibration of a system. And, propagating modes are ..... ?

    Thanks.
     
  2. jcsd
  3. Nov 16, 2011 #2
  4. Nov 18, 2011 #3

    Claude Bile

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    Science Advisor

    It depends on the context.

    In optics, propagating modes are those that accommodate propagating waves; waves that do not diminish in amplitude as they propagate (the antithesis of evanescent waves).

    Claude.
     
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