MHT CET 2025 Physics question
A ray of light is incident on first face of an equilateral glass prism at an angle of incidence 'i'. The emergent ray just grazes along the adjacent face. The refractive index of the prism is . The value of angle of incidence at first face is (, )
Answer: (A)
Solution
Prism angle . The emergent ray grazes the second face, so the angle of emergence is . At the second face: , so and . Using , . At the first face Snell's
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