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Old Oct 30th 2017, 12:47 PM   #1
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Hard Optics Question

A parallel beam of light is incident from air at an angle $a$ on the side $PQ$ of a right angled triangular prism of refractive index $n = \sqrt {2}$.
Light undergoes total internal reflection in the prism at the face $PR$ when $a$ has a minimum value of $45$. The angle $\theta$ of the prism is $...$

I'm so surprised for this question. May I get some help?

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Here is my diagram

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