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NEET Sample Paper NEET Sample Test Paper-46

  • question_answer
    Light incident normally on face AB of a prism as shown in figure. A liquid of refractive index \[\mu \] is placed on face AC of the prism. The prism is made of glass of refractive index 3/2. The limits of p, for which total internal reflection takes place on face AC is -

    A) \[\mu >\frac{\sqrt{3}}{2}\]

    B)                    \[\mu <\frac{3\sqrt{3}}{4}\]

    C)                    \[\mu >\sqrt{3}\]

    D)                    \[\mu <\frac{\sqrt{3}}{2}\]

    Correct Answer: B

    Solution :

    \[60{}^\circ >C\] \[sin\text{ }60{}^\circ >sin\text{ }C\] \[\frac{\sqrt{3}}{2}>\frac{{{\mu }_{r}}}{{{\mu }_{D}}}\] \[\frac{\sqrt{3}}{2}>\frac{\mu }{3/2}\,\,so\,\,\mu \,\,<\,\,\frac{3\sqrt{3}}{4}\]


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