##### What is minimum incident angle required?

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Light enters a glass slab in the shape of an equilateral triangle (the triangle's apex is 60 degrees). Find the minimum incident angle required for light ENTERING the prism, so that the light doesn't undergo total internal reflection upon EXITING the prism. Assume the index of refraction is 1.51 (Plexiglas). Answer to the nearest degree.

May 6th, 2015

sinθi/sinθr = 1.51/1

=>sinθi = 1.51sinθr

θr + θc = 60

sinθc/1 = 1/1.51

=>θc = 41.472 Degrees

=>θr = 60-θc = 18.528 Degrees

=>sinθi = 0.48

=>θi = 28.675 Degrees

May 6th, 2015

Thank you khakaan!

Can you briefly explain how you came to the equation: =>sinθi = 0.48 ?

May 6th, 2015

Thank you khakaan!

Can you briefly explain how you came to the equation: =>sinθi = 0.48 ?

May 6th, 2015

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May 6th, 2015
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May 6th, 2015
Sep 24th, 2017
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