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  4. A small telescope has an objective lens of focal length 144 cm and an eyepiece of focal length 6 cm . The magnifying power of the telescope is

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Q. A small telescope has an objective lens of focal length $144 \,cm$ and an eyepiece of focal length $6\, cm .$ The magnifying power of the telescope is

Ray Optics and Optical Instruments

Solution:

$m=\frac{f_{o}}{f_{e}}=\frac{144}{6}=24$.