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Help with angle of incidence

  1. Jun 1, 2007 #1
    Hey,

    I have a problem.,. Im trying to figure out smallest angle of incidence θ for which a ray can enter the left face of the prism (seen in the pic below) and exit the right face.

    The infomation I have:

    The isosceles prism has apex angle φ = 56.1° and index of refraction n = 1.42

    Diagram:
    http://img520.imageshack.us/img520/5857/fig3355xp0.gif

    Can someone giver me an answer on this?

    Thanks,

    NW
     

    Attached Files:

  2. jcsd
  3. Jun 1, 2007 #2

    Meir Achuz

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    Gold Member

    Work backwards from the critical angle at exit.
     
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