JEE (Advanced) 2016 Paper-1 Question 4

Question 4

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 $$45^\circ$$. The angle $$\theta$$ of the prism is



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