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NEET AIPMT SOLVED PAPER SCREENING 2010

  • 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 45°. 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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