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# The least distance of distinct vision is 25 cm. If the focal length of a convex lens is 10 cm, it acts as a simple microscope with maximum magnification of3.552.53

A
3.5
B
5
C
3
D
2.5
Solution
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#### For a simple microscope, the magnification M is given by 1+Df where D is least distance of distinct vision.M=1+2510=3.5Answer. (C) 3.5

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