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Homework Help: Please help me find speed of light in flint glass

  1. Feb 17, 2008 #1
    1. The problem statement, all variables and given/known data
    A beam of light, wavelength 625 nm in air, is incident on a block of flint glass at an angle of 31.5.
    A) the speed of light in the flint glass

    2. Relevant equations
    Don't know where to start

    3. The attempt at a solution
    refractive index of 1.61
    625 / w = 1.61
    w = 625 / 1.61 = 388 nm.
  2. jcsd
  3. Feb 17, 2008 #2


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    Homework Helper
    Gold Member

    You know the index of refraction of the medium. This should be all you need to find the speed in the glass.

    HINT: How does the speed of light in a material relate to the speed of light in a vacuum and the index of refraction?
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