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NEET 2006 Physics question

PhysicsRay Optics and Optical InstrumentsNEET 2006

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:-

Answer: (1)

Solution

A glass slab of thickness and refractive index makes the mark appear raised by . The image of the mark is thus 1 cm closer to the objective

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Question ID VK-089552