If the focal length of objective lens is increased then magnifying power of\

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(d) : Magnifying power of a microscope, $$ m=\left(\frac{L}{f_{o}}ight)\left(\frac{D}{f_{e}}ight) $$ where $f_{o}$ and $f_{e}$ are the focal lengths of the objective and eyepiece respectively and $L$ is the distance between their focal points and $D$ is the least distance of distinct vision.\ If $f_{o}$ increases, then $m$ will decrease.\ Magnifying power of a telescope, $m=\frac{f_{0}}{f_{e}}$\ where $f_{o}$ and $f_{e}$ are the focal lengths of the objective and eyepiece respectively.\ If $f_{o}$ increases, then $m$ will increase.\