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

3.5

5

2.5

3

A

3.5

B

5

C

3

D

2.5

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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=3.5

Answer. (C) 3.5

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