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(B) The magnifying power $(M)$ of an astronomical telescope is given by the formula $M = \frac{f_o}{f_e}$,where $f_o$ is the focal length of the objec

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Fitting an eyepiece of high power

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(B) The magnifying power $(M)$ of an astronomical telescope is given by the formula $M = \frac{f_o}{f_e}$,where $f_o$ is the focal length of the objective lens and $f_e$ is the focal length of the eyepiece.The power of a lens $(P)$ is defined as $P = \frac{1}{f_e}$ (in meters).Substituting this into the magnification formula,we get $M = f_o 	imes P$.Therefore,to increase the magnifying power $(M)$,we must increase the power $(P)$ of the eyepiece. Thus,fitting an eyepiece of high power increases the magnifying power of the telescope.

The magnifying power of a telescope can be increased by

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