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AMU Medical AMU Solved Paper-2002

  • question_answer
    The speed of light in vacuum is \[\text{3}\times \text{l}{{0}^{\text{8}}}\text{ m}/\text{s}\]and the speed of light in a medium is \[\text{1}.\text{25}\times \text{l}{{0}^{\text{8}}}\text{ m}/\text{s}.\] Then the refractive index of medium is

    A)  1.5                                        

    B)  0.42

    C)  2.4                                        

    D)  3.75

    Correct Answer: C

    Solution :

                     The refractive index of a material is the factor by which the phase velocity of electromagnetic radiation is slowed in that material, relative to its velocity in vacuum. \[\therefore \]  \[\mu =\frac{u}{v}\] Given,   \[\mu =3\times {{10}^{8}}m/s\],   \[v=1.25\times {{10}^{8}}m/s\] \[\therefore \]  \[\mu =\frac{3\times {{10}^{8}}}{1.25\times {{10}^{8}}}=2.4\]


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