What is the difference between normal modes and propagation modes?

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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 ..... ?

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Claude Bile
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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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