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The speed of light in a medium

  1. Jan 28, 2015 #1
    The speed of light changes according to the medium that its in and I don't understand why. Is it because each particles in the medium has a bit of gravitational forces so that the light doesn't travel in a straight line, or perhaps because of something else?
  2. jcsd
  3. Jan 28, 2015 #2


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    Staff: Mentor

    There is an FAQ on the subject: https://www.physicsforums.com/threads/do-photons-move-slower-in-a-solid-medium.511177/ [Broken]
    Last edited by a moderator: May 7, 2017
  4. Jan 28, 2015 #3
    Thanks I'll make sure I check the FAQs next time :)
    Last edited by a moderator: May 7, 2017
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