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Law of Refraction question

  1. Sep 9, 2013 #1
    1. The problem statement, all variables and given/known data

    There's one angle of incidence β onto a prism for which the light inside an isosceles prism travels parallel to the base and emerges at angle β.
    (Figure 1)

    2. Relevant equations


    Find an expression for β in terms of the prism's apex angle α and index of refraction n.
    http://session.masteringphysics.com/problemAsset/1384202/2/23.P58.jpg

    3. The attempt at a solution
    to Use refraction law: n1sin(betta1)=n2sin(betta2). Then express betta2 through alpha. But i am not getting the right answer
     
  2. jcsd
  3. Sep 9, 2013 #2

    ehild

    User Avatar
    Homework Helper
    Gold Member

    Would you please show your work in detail?

    ehild
     
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