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:-
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Shifting in microscope = upward shifting in mark
t [1 - 1/μ] =3 [1 - 1/1.5] = 1 cm
1 CM UPWARD
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