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B
10 X
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C
100 X
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D
None of these
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Solution
The correct option is B 10 X The microscope is the instrument used to see the smallest object that we cannot see by our naked eyes. A compound microscope has eye piece with 10X magnification. It has objective lenses of 10X, 40X and 100 X. So, when it is focused first it is observed through 10X magnification.