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WB JEE Medical WB JEE Medical Solved Paper-2012

  • question_answer
    If the velocity of light in vacuum is \[3\times {{10}^{8}}m{{s}^{-1}},\] the time taken (in nanosecond) to travel through a glass plate of thickness \[10\,cm\]and refractive index 1.5 is

    A)  0.5               

    B)  1.0

    C)  2.0               

    D)  3.0

    Correct Answer: A

    Solution :

     Given \[v=3\times {{10}^{8}}m{{s}^{-1}},d=10\,m\]and \[\mu =1.5\] Here,      \[t=\frac{d}{c/\mu }\] \[t=\frac{10\times {{10}^{-2}}}{2\times {{10}^{8}}}\] \[\left( \because \,\frac{c}{\mu }=\frac{3\times {{10}^{8}}}{1.5}=2\times {{10}^{8}}m{{s}^{-1}} \right)\] \[t=0.5\times {{10}^{-9}}s\]


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