If the focal length of the objective lens is | vedclass

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(D) The magnifying power of a compound microscope is given by $M \approx -\frac{L}{f_o} \cdot \frac{D}{f_e}$,where $f_o$ is the focal length of the ob

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Magnifying power of microscope will decrease but that of telescope will increase

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(D) The magnifying power of a compound microscope is given by $M \approx -\frac{L}{f_o} \cdot \frac{D}{f_e}$,where $f_o$ is the focal length of the objective lens. Thus,if $f_o$ increases,the magnifying power of the microscope decreases.The magnifying power of an astronomical telescope is given by $M = \frac{f_o}{f_e}$. Thus,if $f_o$ increases,the magnifying power of the telescope increases.Therefore,the magnifying power of the microscope will decrease,but that of the telescope will increase.

If the focal length of the objective lens is increased,then:

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