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     EduGorilla 
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    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?

    Options :-

    1. 1 cm upwards
    2. 4.5 cm downwards
    3. 1 cm downwards
    4. 2 cm upwards
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