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JEE Main & Advanced Physics Ray Optics Question Bank Refraction of Light at Plane Surfaces

  • question_answer
    The time required to pass the light through a glass slab of 2 mm thick is (\[{{\mu }_{glass}}=1.5\]) [AFMC 1997; MH CET 2002, 04]

    A)            \[{{10}^{-5}}\,s\]                

    B)            \[{{10}^{-11}}\]\[s\]

    C)            \[{{10}^{-9}}\]s                   

    D)            \[{{10}^{-13}}\]\[s\]

    Correct Answer: B

    Solution :

               \[t=\frac{\mu x}{c}=\frac{1.5\times 2\times {{10}^{-3}}}{3\times {{10}^{8}}}={{10}^{-11}}\]sec


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