A right prism is made by selecting a proper material and the angle ...

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A right prism is made by selecting a proper material and the angle \( A \) and \( B(B \) \( A \) ) as shown in fig. It is desired that a ray of light incident on the face \( \mathrm{AB} \) emerges parallel to the incident direction after two internal reflections.
What should be the minimum refractive index \( \mu \) for this to be possible ?
(a) \( \sqrt{3} \)
(b) \( 1.5 \)
(c) \( \sqrt{2} \)
(d) \( 1.8 \)
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