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A microscope is focused on a mark on a p...

A microscope is focused on a mark on a piece of paper and then a slab of glass of thickness `3cm` 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

C

2 cm upward

D

1 cm upward

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