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Question

The focal length of the objective of a compound microscope is f0 and its distance from the eye piece is L. The object is placed at a distance u from the objective. For proper working of the instrument,

A
L<u
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B
L>u
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C
f0<L<2f0
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D
L>2f0
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Solution

The correct options are
A L>u
D L>2f0
For proper working of the compound microscope, the image I1 must be obtained on the left of the eye lens, otherwise the image I would not be obtained as it is now. For this to happen, the distance between lenses L must be large. Hence L>u and L>2f0
413578_153530_ans_3a2b62d043a046a4a504f0c82372cf0d.png

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