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# A ray of light travelling in a transparent medium of refractive index μ, falls on a surface separating the medium from air at an angle of incidence of 45o . For which of the following value of μ the ray can undergo total internal reflection ?μ=1.33μ=1.50μ=1.25μ=1.40

A
μ=1.25
B
μ=1.40
C
μ=1.33
D
μ=1.50
Solution
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#### For total internal reflection, sin i > sin c where, i = angle of incidence, C = critical angle But, sinC=1μ∴sini=1μorμ=1sini∴μ>1sin45orμ>√2(i=45Given)Hence, option (c) is correct.

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