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Thread: Is Light's Phase Velocity Always C?

  1. #1 Is Light's Phase Velocity Always C? 
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    If it is not always c, then λf=c would be incorrect, and it should be λf=v_p like matter waves, right?
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  2. #2  
    mvb
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    The photon's velocity is always c. Electromagnetic waves are also used in situations where they are not the eigenfunctions of single photons.
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  3. #3  
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    Quote Originally Posted by muon321 View Post
    If it is not always c, then λf=c would be incorrect, and it should be λf=v_p like matter waves, right?
    Speaking classically:

    In a vacuum the phase velocity is c. In a medium it may not be. The ratio c/v_p is the refractive index.
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