1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: 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


    User Avatar
    2017 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!
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted