A microscope is focussed on a mark on a piece of paper and then a slab of glass of thickness \( ...

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A microscope is focussed on a mark on a piece of paper and then a slab of glass of thickness \( 3 \mathrm{~cm} \) and refractive index \( 1.5 \) is placed over the mark. How should be microscope moved to get the mark in focus again
(a) \( 1 \mathrm{~cm} \) downward
(b) \( 2 \mathrm{~cm} \) upward
(c) \( 1 \mathrm{~cm} \) upward
(d) \( 4.5 \mathrm{~cm} \) downward
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