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  4. A convex lens of focal length 12.5 cm is used as a simple microscope. When the image is formed at infinite, Magnification is (Near point for the normal vision is 25 cm ).

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Q. A convex lens of focal length $12.5\, cm$ is used as a simple microscope. When the image is formed at infinite, Magnification is ______(Near point for the normal vision is $25\, cm$ ).

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Solution:

Magnifying power $M=\frac{D}{ f }=\frac{25}{12.5}=2$