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How does light travel faster in optically rarer medium?

  1. Jan 2, 2016 #1
    Is it because that there are less molecules within one unit volume in rarer medium that light is able to travel through it easier?
  2. jcsd
  3. Jan 2, 2016 #2

    Andrew Mason

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    Welcome to PF Anitha!

    Light travels more slowly in any medium other than a vacuum. It is rather complex, actually. There is a very good FAQ on this.

  4. Jan 2, 2016 #3
    Thanks a ton! I clearly understood the reason
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