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Law of Refraction question

  • #1

Homework Statement



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)

Homework 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

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
 

Answers and Replies

  • #2
ehild
Homework Helper
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Homework Statement



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)

Homework Equations




Find an expression for β in terms of the prism's apex angle α and index of refraction n.
23.P58.jpg


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
Would you please show your work in detail?

ehild
 

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