A. increasing focal length of the lens
B. Decreasing focal length of the lens
C. Lens of large aperture
D. lens of short aperture
E. None of these
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In my opinion the magnifying power of simple microscope is inversely proportional to the focal length of the lens..so option (B) is the correct option.
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Focal decreases makes magnification increase. M=1+(d/f). Book Physics Page no 56. Class 10, Punjab text book board.
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