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Speed of Light

  1. Jan 15, 2012 #1
    Does the speed of light vary with different frequencies(or wavelengths) in mediums other than vacuum, or is it constant for all light regardless the frequency?
  2. jcsd
  3. Jan 15, 2012 #2

    Simon Bridge

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    When we are talking about the speed of light in a material, we are talking about the refractive index.
    The refractive index does depend on the wavelength - yes.

    Note: light does not move in a medium.
    ... glass, for eg, does not act as a medium for light when the light is passing through it in the same way as water, string and metal can act as different mediums for sound waves.
    Last edited: Jan 15, 2012
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