Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 227
Fig. 256. Fig. 256, shows a section of an eye in which this defect existsThe rays of light from the source a are refracted so as to form a THE TTNDULATOKY THEOKY. 217 focus at b, between the lens and retina, -whereas they should focusupon the retina at c. 738. Far Sightedness, illustrated in Fig.… … Fig. 257. Thus in Fig. 257, the rays from the source a are not sufficientlyrefracted by the cornea and lens, so that they reach a focus at b,behind the retina, in place of at c, where the retina is situated.The result is an imperfect image. CHAPTER TV. THE UNDULATORY THEORY. 739. The Undulatory…
Physics
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