A ray of light passes from vacuum into a medium of refractive index \( \mu \). The angle of inci...

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A ray of light passes from vacuum into a medium of refractive index \( \mu \). The angle of incidence is twice the angle of refraction. Angle of incidence is
(A) \( \cos ^{-1}\left(\frac{\mu}{2}\right) \)
(B) \( 2 \sin ^{-1}\left(\frac{\mu}{2}\right) \)
(C) \( 2 \cos ^{-1} \frac{\mu}{2} \)
(D) \( 2 \sin ^{-1}(\mu) \)
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