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(B) 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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(B) 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,$f_o$ is the focal length of the objective lens,$D$ is the least distance of distinct vision,and $f_e$ is the focal length of the eyepiece.From this relation,it is clear that the magnification $m$ is inversely proportional to the focal length of the eyepiece $(m \propto \frac{1}{f_e})$.Therefore,to obtain a large magnification,the focal length of the eyepiece $(f_e)$ should be smaller.

In a compound microscope,the magnification will be large if the focal length of the eyepiece is:

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