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JEE Main & Advanced Sample Paper JEE Main Sample Paper-24

  • question_answer
    A wave has velocity v in medium P and velocity 2v in medium Q. If the wave is incident in medium P at an angle of \[{{30}^{o}}\], then the angle of refraction will be:

    A)  \[{{30}^{o}}\]                                   

    B)  \[{{45}^{o}}\]

    C)  \[{{60}^{o}}\]                                   

    D)  \[{{90}^{o}}\]

    Correct Answer: D

    Solution :

    Refractive index \[\mu =\frac{\sin i}{\sin r}\,=\frac{{{v}_{1}}}{{{v}_{2}}}\]        \[\Rightarrow \,\sin \,r=\sin {{30}^{0}}\times \frac{2v}{v}\] \[\Rightarrow \,\sin r=\frac{1}{2}\times 2=1\Rightarrow \,r={{90}^{0}}\]


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