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(A) The magnifying power $M$ of a compound microscope is given by the formula $M \approx \frac{L}{f_o} 	imes \frac{D}{f_e}$,where $L$ is the tube len

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The focal lengths of the objective and the eye piece should be small

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(A) The magnifying power $M$ of a compound microscope is given by the formula $M \approx \frac{L}{f_o} 	imes \frac{D}{f_e}$,where $L$ is the tube length,$D$ is the least distance of distinct vision,$f_o$ is the focal length of the objective lens,and $f_e$ is the focal length of the eyepiece.From this relation,it is clear that the magnifying power $M$ is inversely proportional to both the focal length of the objective $(f_o)$ and the focal length of the eyepiece $(f_e)$.Therefore,to increase the magnifying power,both $f_o$ and $f_e$ should be small.

In order to increase the magnifying power of a compound microscope:

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