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Homework Help: My old question on Optic

  1. Feb 8, 2009 #1
    Well, this is the question from the end term exam of the Optic 1 year 1 ago that I got from the senior, we (me and my friends) get confused. I try to slove this problem by Geometry Optic but the final equation cant slove (if sloved it will be loooooong to slove on the short time). I think abount using Fremat's Principle, but I can't detect the way to mash it.

    so :
    The CALCITE block with the Optic Axis parallel with the surface,the thickness is H
    (ordinary index N and extraordi index Ne
    A beam of light trikes the surface at an angel of incidence of Alpha from the vertical., the plane which keep the beam perpendicular with the OA.
    2 Out beams,the ordinary beam and the extraordinary beam, parallel with the distant L !

    >>Find Alpha

    Fig: http://img178.imageshack.us/my.php?image=opticko7.jpg"

    Yep, that all !

    Hmmm.. This is my 1st post, I hope I didnt post a homework (yeah this is not homework).
    And my English is bad T.T
    Last edited by a moderator: Apr 24, 2017
  2. jcsd
  3. Feb 9, 2009 #2


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    Staff Emeritus
    Science Advisor
    Homework Helper

    Welcome to PF :smile:

    Are you familiar with Snell's Law? I think that will be useful here.
  4. Feb 9, 2009 #3
    Ya ! I used the Snell's law in Geometry Methol, but I think using the wave mothol in sloving,
    If you use the Sneel's law you 'll got the unsloveable quation T.T
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