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Homework Help: Frequency of Light Wave

  1. Apr 7, 2014 #1
    1. The problem statement, all variables and given/known data
    The glass prism has an index of refraction
    that depends on the wavelength of the light
    that enters it. The index of refraction is
    1.44 for light of wavelength 7.245 × 10−7 m
    in a vacuum and 1.79 for light of wavelength
    4.433 × 10−7 m in vacuum. A beam of white
    light is incident from the left, perpendicular
    to the first surface, as shown in the figure,
    and is dispersed by the prism into its spectral

    Determine the frequency of the 7.245×10−7 m
    light in the glass.
    Answer in units of Hz

    2. Relevant equations
    c = λf

    3. The attempt at a solution
    Alright so I calculated the frequency to be 5.03125e-7 (this is correct),
    so I just plugged this into the formula 3*10^8/5.03125e-7 and got 5.96*10^14 m
    I thought I did this correctly. Did I do something silly?
    Last edited: Apr 7, 2014
  2. jcsd
  3. Apr 7, 2014 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    I don't see how it can be. How do you know it is right? Please post your calculation.
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