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Q.

When a ray of light enters a medium of refractive index μ, it is observed that the angle of refraction is half the angle of incidence. The angle of incidence is :

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a

2cos−1μ

b

2sin−1μ/2

c

cos−1μ/2

d

2cos−1μ/2

answer is A.

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Detailed Solution

μ=SiniSinr and r=i2

μ=sin isin i/2=2cos (i/2)

cos i/2=μ2         i=2 cos-1μ2

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