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Homework Help: Index of refraction

  1. Mar 15, 2005 #1
    I have input rays into a glass plate and output rays for this glass plate also. How can I prove that they are indeed parallel. I'm thinking all I need to do is extend the inout and output rays, and indicate that they are both 180 deg. Visually, they will appear parallel anyways.
  2. jcsd
  3. Mar 15, 2005 #2


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    You could use Snell's law and show that the angle of incidence at the first surface is equal to the angle of refraction at the surface where the beam leaves the plate.

    Supplied with a pretty picture ofcourse.
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