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Angular Magnification in Telescope

An astronomic...

Question

An astronomical telescope when in normal adjustment has magnifying power $5$ . If the distance between two lenses is $24 c m$ , then find the focal length of the objective lens.

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Solution

Given :- $\frac{f_{0}}{f_{e}} = 5$
& $f_{0} + f_{e} = 24 c m$
$f_{0} = 5 f_{e}$
$6 f_{e} = 24 c m$
$f_{e} = 4 c m$
$& f_{0} = 20 c m$

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