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JEE Main & Advanced Physics Ray Optics Question Bank Total Internal Reflection

  • question_answer
    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 [IIT-JEE 1998]

    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 \[\sin 45{}^\circ >\frac{1}{n}\]Þ \[n>\sqrt{2}\] Þ n > 1.4


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