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Which travels more slowly in glass, red light or violet light?

  1. Mar 29, 2008 #1
    Which travels more slowly in glass, red light or violet light?

    Violet...right?

    Thanks
     
  2. jcsd
  3. Mar 29, 2008 #2

    nrqed

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    Why? What is your argument?
    You need to know how the index of refraction depends on the wavelength, a dispersive effect.
     
  4. Mar 29, 2008 #3
    what? all the question asks for is a color...
     
  5. Nov 19, 2011 #4
    they both travel at the speed of light, it's the same
     
  6. Nov 19, 2011 #5

    SammyS

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    The speed of light in the glass is not the same for all wavelengths. The index of refraction is frequency - wavelength dependent, otherwise there would br no spectrum from a prism.
     
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