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(A) The magnifying power $(M)$ of a simple microscope is given by the formula $M = \frac{D}{v}$,where $D$ is the least distance of distinct vision $(2

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$\frac{25}{f}$

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(A) The magnifying power $(M)$ of a simple microscope is given by the formula $M = \frac{D}{v}$,where $D$ is the least distance of distinct vision $(25 \ cm)$ and $v$ is the image distance.For a simple microscope,the magnifying power is defined as $M = 1 + \frac{D}{f}$ when the image is formed at the near point $(v = D)$.When the final image is formed at infinity,the object must be placed at the principal focus of the lens $(u = f)$.In this case,the magnifying power is given by $M = \frac{D}{f}$.Substituting $D = 25 \ cm$,we get $M = \frac{25}{f}$.

In a simple microscope,if the final image is located at infinity,then its magnifying power is:

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