Millikan, Robert Andrews, Gale, Henry Gordon · Boston : Ginn and Co. · leaf 456
e image is not viewed with the unaided eye,but with a simple magnifying glass called an eijepiece (Fig. 433), placedso that the image is at its focus. Since we have seen in § 456 that thesimple magnifying glass increases the visual angle 25//times,/beingthe focal length of the eyepiece, it is clear… … Fig. 433. The magnifying power of a telescope is F/f produced by both lenses, used as above, is 7^/2.5 x ilo/f=F/f. Tltemagnifying poicer of an astronomical telescope is therefore the focal length ofthe ohjectice divided hj the focal length of the eyepiece. It will be seen,therefore, that toget a…
Physics
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