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Optics: light refraction in prisms

  1. Aug 8, 2014 #1
    Could you please check the following problem?
    The book made an approximation. I didn't in my method. But the difference seems considerable. Did I make a mistake?
     

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  2. jcsd
  3. Aug 8, 2014 #2

    TSny

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    Your analysis looks good. I think maybe the textbook was assuming a different relative orientation between the prism and the wall. See attached figure. But the problem statement is not clear on this point.
     

    Attached Files:

  4. Aug 8, 2014 #3
    EDIT: I get it now.
    But, would using that approximation be fine for my picture?
     
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