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Angle of refraction through a prism

  1. Nov 7, 2014 #1
    1. The problem statement, all variables and given/known data

    In a physics lab, light with a wavelength of 570nmtravels in air from a laser to a photocell in a time of 17.5ns . When a slab of glass with a thickness of 0.890m is placed in the light beam, with the beam incident along the normal to the parallel faces of the slab, it takes the light a time of 20.7ns to travel from the laser to the photocell.

    What is the wavelength of the light in the glass?
    2. Relevant equations
    snell's law (ni)sin(Θi)=(nr)sin(Θr)

    3. The attempt at a solution
    1sin70°=1.53sinΘ Θ=37.89°

    1sin70°=1.525sinΘ Θ=38.04°


    Fairly sure what I've done is wrong though
  2. jcsd
  3. Nov 7, 2014 #2


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    Homework Helper

    Welcome to PF!

    Check the problem text. It has nothing common with the title of the thread or the solution. Have you copied a different problem by mistake :) ?
  4. Nov 8, 2014 #3
    oh wow, didn't even see that.
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