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Homework Help: Trace the path of the light ray and find angle of refraction

  1. Nov 23, 2008 #1
    1. The problem statement, all variables and given/known data

    A ray of light strikes the midpoint of one
    face of an equiangular (60◦, 60◦, 60◦) glass
    prism (n = 1.3) at an angle of incidence of
    a.Trace the path of the light ray through the
    glass, and find the angle of refraction at the
    first surface.
    b.Find the angle of incidence at the second
    Answer in units of ◦
    c.Find the angle of refraction at the second
    Answer in units of ◦.

    2. Relevant equations

    n1sin(theta1) = n2sin(theta2)

    3. The attempt at a solution

    So I have part a correct which is 24.7685 degrees. I used the equation to solve for theta2. However I cannot get b because my reasoning is that the angle of refraction in part a is the angle of incidence in part b and this is obviously not right. I do not know where to go from here.
  2. jcsd
  3. Nov 23, 2008 #2


    User Avatar
    Homework Helper

    Re: Prism

    Maybe draw a diagram and remember the second surface is at a 60° angle to the first.
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