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  4. If f0 and fe are the focal lengths of the objective and eye-piece respectively of a telescope, then its magnifying power will be

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Q. If $f_0$ and $f_e$ are the focal lengths of the objective and eye-piece respectively of a telescope, then its magnifying power will be

KCETKCET 2000Ray Optics and Optical Instruments

Solution:

Magnification of a telescope is given by $m = \frac{f_0}{f_e},$ where $f_0$ is the focal length of the objective lens and $f_e$ is the focal length of eye-piece.