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NEET Sample Paper NEET Sample Test Paper-80

  • question_answer
    A ray falls on a prism ABC \[(AB =BC)\] and travels as shown in figure. The minimum refractive index of the prism material should be  

    A)  4/3                              

    B)  \[\sqrt{2}\]

    C)  1.5                              

    D)  \[\sqrt{3}\]

    Correct Answer: C

    Solution :

    Angle at both focus will be \[45{}^\circ \]. For TIR to take place,\[i\,\,>\,\,{{\theta }_{C}}\] or           \[\sin  i \,>\, sin\,\,{{\theta }_{C}}\] \[\therefore \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\frac{1}{\sqrt{2}}>\frac{1}{\mu }\] or            \[\mu \, >\,\,\sqrt{2}\].


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