A microscope is focused 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:-

1. A. 1 cm upward
2. B. 4.5 cm downward
3. C. 1 cm downward
4. D. 2 cm upward

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