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Homework Help: Optics, refraction at spherical surface

  1. Feb 7, 2013 #1
    1. The problem statement, all variables and given/known data
    (see attachment)

    2. Relevant equations

    3. The attempt at a solution
    I don't quite understand the question. It asks the distance of the "unilluminated patch" from the cylinder. There will be only a single point where the rays will intersect. Rest everywhere, it is unilluminated or am I missing something?

    Any help is appreciated. Thanks!

    Attached Files:

    Last edited: Feb 7, 2013
  2. jcsd
  3. Feb 7, 2013 #2


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    Science Advisor
    Homework Helper

    Hi Pranav-Arora! :smile:

    Hint: critical angle. :wink:
  4. Feb 7, 2013 #3
    Thanks a lot tiny-tim! That solved the problem in an instant. :smile:
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