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

  • question_answer
    Light takes 8 min 20 sec to reach from sun on the earth. If the whole atmosphere is filled with water, the light will take the time    (\[_{a}{{\mu }_{w}}=4/3\])

    A)            8 min 20 sec                          

    B)            8 min

    C)            6 min 11 sec                          

    D)            11 min 6 sec

    Correct Answer: D

    Solution :

               \[\mu =\frac{{{c}_{a}}}{{{c}_{w}}}=\frac{{{t}_{w}}}{{{t}_{a}}}\Rightarrow {{t}_{w}}=\frac{25}{3}\times \frac{4}{9}=11\frac{1}{9}=11\]min 6 sec


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