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1 May, 22:42

An astronomical telescope has an objective of diameter 20 cm with a focal length of 180 cm. the telescope is used with an eyepiece of focal length 30 mm. what is the angular magnification of this telescope?

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  1. 1 May, 23:05
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    By definition;

    M = fo/fe

    Where,

    M = Angular magnification

    fo = Focal length of objective lens

    fe = Focal length of eyepiece lens

    From the information given;

    M = 180/30 = 6
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