The magnifying power of a simple microscope when the final image is formed at $D = 25 cm$ from eye is :
( $f$ is the focal length)

1 + \frac{D}{f}

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1 - \frac{D}{f}

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1 + \frac{f}{D}

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\frac{D}{f}

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Solution

The correct option is A $1 + \frac{D}{f}$
This is the case when the image is formed at near point. The magnifying power of a simple microscope,

$m = 1 + \frac{D}{f}$

where $f$ is the focal length of the lens and $D$ is the least distance of distinct vision ( $25 cm$ )
Shorter the focal length, more the magnifying power.

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