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Question about velocity change

  1. Jun 17, 2010 #1
    If the velocity of a light wave is less in a medium
    than it is in vaccuum, does that mean.
    • the wavelength is changing during propagation?
    • the frequency is changing?
    • both?
  2. jcsd
  3. Jun 17, 2010 #2
    The frequency does not change. The wavelength does.
  4. Jun 17, 2010 #3
    but how it can be .if you reduce wavelength your frequency becomes bigger.i do not see the logic.As fo me they both are changing.please argument
  5. Jun 17, 2010 #4

    Doc Al

    User Avatar

    Staff: Mentor

    Only if you keep the speed constant, which is not the case here. What is true, is that speed = freq X wavelength. Both speed and wavelength decrease.
  6. Jun 17, 2010 #5
    frequency is proportional to the period
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