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Question

A ray of light travelling in transparent medium of refractive index μ falls on a surface separating the medium from air at an angle of incidence of 45. For which of the following value of μ the ray can undergo TIR?

A
μ>1.33
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B
μ>1.4
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C
μ>1.2
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D
μ>1.25
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Solution

The correct option is B μ>1.4

Condition for TIR
iC
sin isin C ....(1)
sin C=1μ use equation (1)
sin i1μμ2μ1.412


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