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Using Snell's Law with a Prism

  1. Oct 18, 2012 #1
    1. The problem statement, all variables and given/known data

    Light is incident on an equilateral glass prism at a 45.0 °angle to one face. Calculate the angle at which light emerges from the opposite face. Assume that n = 1.49.
    θ4 = ?

    2. Relevant equations

    n1 * sin θ1 = n2 * sin θ2

    3. The attempt at a solution

    n1 = 1.00 (air)
    n2 = 1.49
    sin 45° = 0.707

    n1 * sinθ1 / 1.49 = sin θ2

    sin θ 2 = 0.474
    θ2 = 28.33°

    I'm having trouble finding θ3.

    n2 = 1.49
    θ2 = 28.33°
    n3 = 1.49
    θ3 = ??

    Attached Files:

    Last edited: Oct 18, 2012
  2. jcsd
  3. Oct 18, 2012 #2
    I suggest that you draw a diagram. Then knowing the angle you just found, you can calculate the angle at which the light is incident from glass to air at the second face of the prism.
    Then use the same method as before.
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