20. A right prism is to be made by selecting a proper material and the angles \( A \) and \( B(B... VIDEO
20. A right prism is to be made by selecting a proper material and the angles \( A \) and \( B(B \leq A) \), as shown in Fig. \( 9(Q) .17 \). It is desired that a ray of light incident normally on \( A B \) emerges parallel to the incident direction after two internal reflections. (a) What should be the minimum refractive index \( \mu \) for this to be possible ? (b) For \( \mu=5 / 3 \), is it possible to achieve this with the angle \( A \) equal to 60 degrees?https://bit.ly/YTAI_PWAP https://www.pw.live
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\[
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\[
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\[
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