A ray of light falls on a transparent slab of \( \mu=1.0 \). If reflected and refracted rays are...

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A ray of light falls on a transparent slab of \( \mu=1.0 \). If reflected and refracted rays are mutually perpendicular, what is the angle of incidence ?
(A) \( 45^{\circ} \)
(B) \( 60^{\circ} \)
(C) \( 30^{\circ} \)
(D) \( 90^{\circ} \)
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