Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    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.
    http://en.wikipedia.org/wiki/Refractive_index#Dispersion

    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
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Speed of Light
  1. Speed of light (Replies: 5)

  2. Speed of light (Replies: 10)

  3. Speed of light (Replies: 7)

Loading...