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Homework Help: Index of Refraction in a Prism

  1. Oct 30, 2012 #1
    1. The problem statement, all variables and given/known data
    For my lab I beamed a laser through an equilateral triangular prism. The angle of incidence was 13 degrees. The light left the prism at an angle 15 degrees to the normal. How would I calculate the index of refraction of the prism? (air = 1)

    2. Relevant equations
    The equation I need to use is θ_c = sin^-1 (n2/n1)
    Snell's law

    3. The attempt at a solution
    I have tried using snell's law to find the first refraction in the prism. 1.00*(sin13) = n_2*θ_2. I believe to find θ_2, I need to use the geometry of the triangle, but am not sure where to begin
  2. jcsd
  3. Oct 30, 2012 #2


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    welcome to pf!

    hi mikeyplus10! welcome to pf! :smile:

    (try using the X2 and X2 buttons just above the Reply box :wink:

    first, draw a diagram, including the normals

    (and remember that the angle between two lines is the same as the angle between their normals)
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