MHT CET 2025 Physics question
A monochromatic ray of light is incident normally on a thin prism of refracting angle A. The ray is deviated through an angle ( in passing through the prism. The ray reflected internally from the second face emerges from the first face making an angle of ( with the incident ray. The refractive index of the prism is
Answer: (B)
Solution
Normal incidence on a thin prism: the ray meets the second face at angle of incidence , so the deviation is . The ray reflected from the second face (angle of incidence ) travels back and meets the first face at an angle of incidence (the reflection turns it through ).
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