A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 632
l length. Thus,near objects can be clearly seenbut distant objects cannot, andhence the name short-sight. In order to find the requisitefocal length for the lens L, let anobject be slowly carried away from the eye. At a certain point clearvision ceases ; this is called the far point. Let its… … Fig. 560.—Short-sight and its correction. Ill v dY \ 608 LIGHT CHAP. Now let f1 be the focal length of the lens L required to make v thefocal length of the combination (Fig, 560 (&)), so that the eye withthe lens in front can see clearly points <at infinity. Then 1 1 / 599).
Physics
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