An astronomical telescope of tenfold angular magnification has a length of 44 cm. The focal length of the objective is

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Correct answer: D. (d): Length of astronomical telescope (f_0+f_e)=44 cm and ratio of focal length of the objective lens to that of the eye piece f_0f_e=1 0 From the given ratio, we find that f_0=1 0 f_e. Therefore 1 0 f_e+f_e=4 4 or f_e=4 cm and focal length of the objective (^f_0) =4 4−f_e=4 4−4=4 0 c m.

$An astronomical telescope of tenfold angular magnification has a length of 44 cm. The focal length of the objective is$

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