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A microscope is focussed on a mark on a ...

A microscope is focussed on a mark on a piece of paper and then a slab of glass of thickness 3 cm and refractive index `1.5` is placed over the mark. How should the microscope be moved to get the mark in foucs again ?

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Microscope will have to be lifted up by a distance `d=t-1/mu=3-3/1.5=1cm` upwards.
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