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A parallel beam of light is incident form air at an angle α on the side PQ of a right angled triangular prism of refractive index n = 2 . Light undergoes total internal reflection in the prism at the face PR when α has a minimum value of 45° . The angle θ of the prism is P θ R Q α n = 2
- 15°
- 22.5°
- 30°
- 45°
Correct answer: 15°
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