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(B) The magnification $(M)$ of a compound microscope is given by the formula $M \approx \frac{L}{f_o} 	imes \frac{D}{f_e}$, where $L$ is the length o

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(B) The magnification $(M)$ of a compound microscope is given by the formula $M \approx \frac{L}{f_o} 	imes \frac{D}{f_e}$, where $L$ is the length of the tube, $f_o$ is the focal length of the objective lens, $f_e$ is the focal length of the eyepiece, and $D$ is the least distance of distinct vision.Since $M$ is directly proportional to the tube length $L$ $(M \propto L)$, increasing the tube length $L$ results in an increase in the magnification of the compound microscope.

If the tube-length $(L)$ of a compound microscope increases, then its magnification . . . . . . .

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