NEET2014Physics-Optics
NEET 2014 Physics Prisms MCQ Question
Type: MCQ-conceptual-Hard-Class 12
The angle of a prism is A. One of its refracting surfaces is silvered. Light rays falling at an angle of incidence 2A on the first surface returns back through the same path after suffering reflection at the silvered surface. The refractive index μ, of the prism is
A
2 sin A
B
2 cos A
C
1/2 cos A
D
tan A
Correct Answer
Option A
Detailed Explanation
For the light to retrace its path, the angle of incidence must equal the angle of emergence. Using Snell's law and the geometry of the prism, μ = 2 sin A.
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