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

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    A glass slab of thickness 3 cm and refractive index 3/2 is placed on ink mark on a piece of paper. For a person looking at the mark at a distance 5.0 cm above it, the distance of the mark will appear to be     [Kerala PMT 2005]

    A)            3.0 cm                                     

    B)            4.0 cm

    C)            4.5 cm                                     

    D)            5.0 cm

    Correct Answer: B

    Solution :

               The apparent depth of ink mark                    \[=\frac{\text{real}\,\text{depth}}{\mu }\]\[=\frac{3}{3/2}=2\,cm\]                    Thus person views mark at a distance \[=2+2=4\,cm\].


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