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Question

Light is going from some denser medium  to air. The refractive index of the medium is 1.7. Calculate the angle of incidence, such that if it is further increased, total internal reflection will occur in medium I.



A
sin1(13)
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B
sin1(12)
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C
sin1(15)
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D
Such an angle of incidence can't be calculated
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Solution

The correct option is A sin1(13)

That angle must be the criticle angle.
sin θsin.90=11.7
θ=sin1(13)

Physics

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