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NEET Sample Paper NEET Sample Test Paper-38

  • question_answer
    A ray of light travelling in a transparent medium of refractive index\[\mu \]falls, on a surface separating  the medium from air at an angle of incidence of \[\text{45 }\!\!{}^\circ\!\!\text{ }\]. For which of the following value of \[\mu \]the ray can undergo total internal reflection?

    A) \[\mu =1.33\]

    B) \[\mu =1.40\]

    C) \[\mu =1.50\]

    D) \[\mu =1.25\]  

    Correct Answer: C

    Solution :

     For total internal reflection \[i>c\] \[\Rightarrow \]\[\sin i>\sin c\Rightarrow \sin {{45}^{o}}>\frac{1}{\mu }\] \[\Rightarrow \]\[\mu >\sqrt{2}\Rightarrow \,\,\mu >1.4\]


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