NEET Sample Paper NEET Sample Test Paper-34

  • question_answer A prism ABC of angle \[30{}^\circ \] has its face AC silvered. A ray of light incident at an angle of \[{{45}^{o}}\] at the face AB retraces its path after refraction at face AB and reflection at face AC. The refractive index of the material of the prism is :-

    A)  \[1.5\]

    B)  \[\frac{3}{\sqrt{2}}\]

    C)  \[\sqrt{2}\]

    D)  \[\frac{4}{3}\]

    Correct Answer: B

    Solution :

    \[A=r+0\Rightarrow r={{30}^{o}}\] \[\therefore \] \[\mu =\frac{\sin i}{\sin r}=\frac{\sin {{45}^{o}}}{\sin {{30}^{o}}}=\sqrt{2}\]


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