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Question

A ray of light travelling in a transparent medium falls on a surface separating the medium from air at an angle of incidence 45o and undergoes total internal reflection. lf μ is the refractive index of medium the possible values of μ are

A
μ=1.3
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B
μ=1.4
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C
μ=1.5
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D
μ=1.6
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Solution

The correct options are
A μ=1.5
C μ=1.6
Since, the ray undergoes total internal reflection,
μ>1sinc

Now,i=45

Thus, sin c<sin i

Thus, μ>1sini

OR, μ>2

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