An astronomical telescope consists of 2 thin lenses set 36 cm apaert and has a mp a. Calculate the focal length of the lenses
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In normal adjustment the image forms at infinity
So f o +f e
=36 , o is for objective and and e for eye piece
Also magnification is 8
8= fe/f o
f o =8f e
on solving we get fo
=32cmf e
=4cm
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