Millikan, Robert Andrews, Gale, Henry Gordon · Boston : Ginn and Co. · leaf 454
ssthrough the center of the eye from P and Q are parallel to thelines through Pc and Qc. But if the lens were not present, andif the ol)ject were 25 centimeters from the eye, the visual anglewould be the small angle j^cq (Fig. 431, (2)). The magnify-ing power of a simple lens is due, therefore, to… … Fig.431. power of a lens 396 IMAGE FORMATION The less the focal length of the lens, the nearer to it may theobject be placed, and therefore the greater the visual angle,or magnifying power. The ratio of the two angles PcQ and j^cq is approximately25/f, where / is the focal length of the lens…
Physics
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