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The magnifying power of a refracting type of astronomical telescope is ' $\mathrm{m}$ '. If focal length of eyepiece is doubled then the magnifying power will become
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$\frac{\mathrm{m}}{2}$
Magnifying power, $m=\frac{f_o}{f_e}$
If $\mathrm{f}_{\mathrm{e}}$ is doubled, the magnifying power will become $\frac{\mathrm{m}}{2}$
If $\mathrm{f}_{\mathrm{e}}$ is doubled, the magnifying power will become $\frac{\mathrm{m}}{2}$
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