Question: A microscope is focussed on a mark on a piece of paper and then a slab of glass of thickness 3 cm and refractive

A microscope is focussed on a mark on a piece of paper

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 focus again? (a) 4.5 cm downward (b) 1 cm downward. (d) 1 cm upward (c) 2 cm upward

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