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A question about optics

  1. Apr 24, 2013 #1
    I read in a book!If the electrons emit a light wave which is 90° out of phase with the light wave shaking them, it will cause the total light wave to travel more slowly. BUT I don't know why???anybody can help? Thank you!
     
  2. jcsd
  3. Apr 24, 2013 #2
    I assume that you are describing an energy storage mechanism which stores the photon energies and release them a quarter wavelength later.

    The light wave will effectively be slowed down by the quarter-wavelength photon storage time.

    Is this relevant to the question?
     
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