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  • Ex: A ray of light travelling in a transparent medium falls on a surface separating the medium from air at an angle of incidence of 45°. The ray undergoes total internal reflection. If n is the refractive index of the medium with respect to air, select the possible value (s) of n from the following.
    A) 1.3 
    B) 1.4
    C) 1.5 
    D) 1.6
     
    Correct Answer: D
    Solution : For TIR i > C Þ sin i > sin C Þ sin45∘> 1/n | Þ n > √2 | Þ n > 1.4
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