Elements of human physiology (1907) Elements of human physiology elementsofhumanp05star Year: 1907 SPECIAL SENSES 551 Figs, 240 and 241 represent the course of a ray of light in passing through a plate of glass with parallel sides, and through a prism. Fm. 241. By means of a convex lens the rays of light from any one source may all be refracted so as to meet at a point. The point at which parallel rays of light (such as the sun's rays) meet is called the principal focus of the lens (Fig. 242). Fig. 242.

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