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NEET Sample Paper NEET Sample Test Paper-53

  • question_answer
    A ray of monochromatic light is incident on the plane surface of separation between two media [a] and [b] with angle of incidence 'i' in the medium [a] and angle of refraction 'r' in the medium [b]. The graph shows the relation between sin r and sin i, then which of the following statements are correct-

    A) the speed of light in the medium [b] is \[\sqrt{3}\] times than in medium [a]

    B) the speed of light in the medium [b] is \[\frac{1}{\sqrt{3}}\] times than in medium [a]

    C) the total internal reflection can take place when the incidence is in medium [a]

    D) the total internal can take place when the incidence is medium [b]

    Correct Answer: B

    Solution :

    \[\frac{\sin \,r}{\sin \,i}\,=\,\,\tan \,30\,\,=\,\,\frac{1}{\sqrt{3}}\,\,=\,\,\frac{{{\mu }_{1}}}{{{\mu }_{2}}}\,\,=\,\,\frac{{{v}_{2}}}{{{v}_{1}}}\] \[so\,\,\Rightarrow \,\,\,{{v}_{2}}\,\,=\,\,\frac{{{v}_{1}}}{\sqrt{3}}\]


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