MHT CET 2026 Physics question
The prism has refracting angle A. The second refracting surface of the prism is silvered. Light ray falling on first refracting surface with angle of incidence 2A, reaches the second surface and returns back through same path due to reflection at the silvered surface. The refractive index of the material of prism is
Answer: (B)
Solution
The ray retraces its path only if it strikes the silvered face normally. Then the angle of refraction at the first surface and the angle of incidence at the second surface satisfy with , so . Snell's law at the first surface: \frac{\sin i}{\sin r_1}$ =
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