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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 again in focus ?

A

2 cm upward

B

1 cm upward

C

4.5 downward

D

1 cm downwards.

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