Q.

A ray of light passes from vacuum into a medium of refractive index µ. The angle of incidence is twice the angle of refraction. Angle of incidence is

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a

cos−1μ2

b

2cos−1μ2

c

2sin−1μ2

d

2sin−1μ

answer is B.

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Detailed Solution

μ=sin  isin  r⇒μ=sin  isini2⇒μ=2sini2cosi2sini2or    cosi2=μ2    or   i2=cos−1μ2or   i=2cos−1μ2
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A ray of light passes from vacuum into a medium of refractive index µ. The angle of incidence is twice the angle of refraction. Angle of incidence is