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Question about Light

  1. Feb 19, 2004 #1
    IM not sure that this question should be here or in some other forum, anyway here is my question :

    When light travels from a more dense material to a less dense one (say from water to air) the light speeds up again. However i would like to know WHY it speeds up again, and what gives it the energy to do so, as it doesent seem to accelerate (or ive never heard that it does)
  2. jcsd
  3. Feb 19, 2004 #2
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