A parallel beam of light is incident from air at an angle α on the side PQ of a right angled triangular prism of refractive index μ=√2. Light undergoes total internal reflection at the face PR when α has a minimum value of 45∘. The angle θ of the prism is:

A parallel beam of light is incident from air at an angle α on the si

1.	A parallel beam of light is incident from air at an angle α on the side PQ of a right angled triangular prism of refractive index μ=√2. Light undergoes total internal reflection at the face PR when α has a minimum value of 45∘. The angle θ of the prism is:
Answer» A parallel beam of light is incident from air at an angle $α$ on the side $PQ$ of a right angled triangular prism of refractive index $μ = \sqrt{2} .$ Light undergoes total internal reflection at the face $PR$ when $α$ has a minimum value of $45^{\circ}$ . The angle $θ$ of the prism is:

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A parallel beam of light is incident from air at an angle α on the side PQ of a right angled triangular prism of refractive index μ=√2. Light undergoes total internal reflection at the face PR when α has a minimum value of 45∘. The angle θ of the prism is:

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