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Homework Help: Angle of an emerging ray through two boundaries

  1. Jun 10, 2004 #1
    Thank-you for taking the time to read my problem. I am currently doing work with light and boundaries and have come accross a question that I am having a hard time understanding. I know how to calculate angles when they go through one boundry but I can not figure out how to do it when there is 2 boundaries.

    Look at the diagram. Calculate the angle of the emerging ray in air. Assume that the first and second boundaries are parallel.
    Diagram: http://img27.imageshack.us/img27/6221/scan.jpg [Broken]
    (thanks to http://www.imageshack.us/ for the free image hosting)

    I understand the question well. The ray is in air, crosses the boundary into the diamond, and then crosses the second boundary back into air where I have to figure out the angle. Where I am stumped is that second boundary. Thank-you for any help you may be able to give me.
    Last edited by a moderator: May 1, 2017
  2. jcsd
  3. Jun 10, 2004 #2

    Doc Al

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    Staff: Mentor

    Snell's law-done twice

    Apply Snell's law of refraction at each boundary. Question/hint: if the angle of refraction of the light after crossing the first boundary is [itex]\theta_2[/itex], what will be the angle of incidence of that light before crossing the second boundary?
  4. Jun 11, 2004 #3
    Thank-you very much for your help. It was able to give me a good start into the question. :).
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