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Pass light through helium-3 it slows it down?

  1. Apr 5, 2009 #1
    Is it true, if you pass light through helium-3 it slows it down? Shouldn't the light speed constant interfere with our perception of it?

    By the way, I'm only half sure it's helium-3. But it's definitely helium.
     
  2. jcsd
  3. Apr 5, 2009 #2
    Re: Helium-3

    Light in any medium (air, water, glass, helium-3) slows down. The speed of light in vacuum is what is invariant.
     
  4. Apr 6, 2009 #3
    Re: Helium-3

    Thanks, that really helped. :smile:
     
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