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

  • question_answer
    A microscope is focussed on a coin lying at the bottom of a beaker. The microscope is now raised up by 1 cm. To what depth should the water be poured into the beaker so that coin is again in focus? (Refractive index of water is\[\frac{4}{3}\]) [BHU 2003]

    A)            1 cm                                         

    B)            \[\frac{4}{3}\] cm

    C)            3 cm                                         

    D)            4 cm

    Correct Answer: D

    Solution :

                       Suppose water is poured up to the height h,            So \[h\left( 1-\frac{1}{\mu } \right)=1\] \[\Rightarrow h=4\ cm\]


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