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Q.

A prism ABC of angle 30° has its face AC silvered. A ray of light incident at an angle of 45° at the face AB retraces its path after refraction at face AB and reflection at face AC. The refractive index of the material of the prism is

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a

1.5

b

32

c

2

d

43

answer is C.

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Detailed Solution

A=r+0⇒r=30∘ ∴μ=sin⁡isin⁡r=sin⁡45∘sin⁡30∘=2
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