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Question

A microscope is focused on an ink dot on a white paper. A glass slab of thickness 0.03m with μ=1.5 is placed on the paper. To focus the ink dot clearly the microscope must be:

A
Raised by 0.02m
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B
Lowered by 0.02m
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C
Raised by 0.01m
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D
Lowered by 0.01m
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Solution

The correct option is B Raised by 0.01m
Shift in the object
=(11μ)Δt=(111.5)×0.03m
=0.01m
So,to focus the ink drop, the microscope must be raised by 0.01m. as we are in rarer medium the image appears raised. so, the microscope needs to be raised 0.01m to focus clearly.

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