Consider a refracting telescope whose objective has a focal length of 1 m and the eyepiece a focal length of 1 cm, then magnifying power of this telescope will be .

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Accepted Answer

(4) 100. Given: fₒ=1 m for the objective and fₑ=1 cm for the eyepiece. Idea: in normal adjustment a refracting telescope magnifies by m=(fₒ)/(fₑ), with both focal lengths in the same unit. fₒ=1 m=100 cm m=(100 cm)/(1 cm)=100 The whole art of a telescope is in that ratio: a long objective and a short eyepiece.

Consider a refracting telescope whose objective has a focal length of 1 m and the eyepiece a focal length of 1 cm, then magnifying power of this telescope will be ________.

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Why the other options are wrong