A light beam enters the prism below. The prism is surrounded by air. If the light beam strikes surface 2 at the critical angle what is theta1?

A light beam enters the prism below. The prism is surrounded by air. If the light beam strikes surface 2 at the critical angle what is theta1?

http://www.d.umn.edu/~djohns30/phys1002-1/review/pict15.png

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