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  4. A least distance of distinct vision is 25 cm. The focal length of a convex lens is 5 cm. It can act as a simple microscope of magnifying power

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Q. A least distance of distinct vision is 25 cm. The focal length of a convex lens is 5 cm. It can act as a simple microscope of magnifying power

CMC MedicalCMC Medical 2007

Solution:

Magnifying power, $ m=1+\frac{D}{f} $ Given $ D=25\,cm, $ $ f=5\,cm $ $ \therefore $ $ m=1+\frac{25}{5} $ $ \Rightarrow $ $ m=1+5=6 $