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What is the phase velocity of light in glass?

  1. May 17, 2013 #1
    1. The problem statement, all variables and given/known data

    What is the phase velocity of light in glass if n=1.5 at λ=500nm

    2. Relevant equations

    n=c/vp =λ0/λ


    3. The attempt at a solution

    1.5 = (3x10^8) / vp
    vp = (3x10^8)/1.5

    I'm not entirely sure if the equation I have used is the correct one. It does not use the λ=500nm as given in the question.
     
  2. jcsd
  3. May 17, 2013 #2

    mfb

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    2016 Award

    Staff: Mentor

    It is right, and you do not need the wavelength. In general, n will depend on the wavelength, but that is not relevant here.
     
  4. May 17, 2013 #3
    Thanks mfb!
     
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