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How much will a ray be deviated ?

  1. Jul 26, 2011 #1
    How much will a ray be "deviated"?

    So my terrible phys prof presented this question but failed
    to answer it and I have become very curious of the answer
    after failing to answer it several times.

    Here is a quick paint drawing of my question:

    http://img17.imageshack.us/img17/8624/deflection.jpg [Broken]

    Uploaded with ImageShack.us

    A "blue" light ray passes through glass of thickness T. The entry
    and exit angles are the same, but it is "deviated' by a difference
    "x" as i tried to show in the figure. This distance is the distance from
    the two parallel green lines. This is not in my textbook, but my prof
    just said it is approximately the thickness T times the sin of the incident
    angle. The textbook does not have this. Does anyone happen to know
    this or know how to quickly prove this? thanks so much in advance.

    Last edited by a moderator: May 5, 2017
  2. jcsd
  3. Jul 26, 2011 #2


    User Avatar

    Staff: Mentor

    Re: How much will a ray be "deviated"?

    Welcome to the PF.

    You would use Snell's Law to work on this problem. Are you familiar with Snell's Law?


    Last edited by a moderator: May 5, 2017
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