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 of
A
2.5
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B
3
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C
3.5
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D
5
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Solution
The correct option is A 3.5 For a simple microscope, the magnification M is given by 1+Df where D is least distance of distinct vision.