. Elements of human physiology. Physiology. 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. 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. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appe
. Elements of human physiology. Physiology. 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. 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. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Starling, Ernest Henry, 1866-1927. Chicago : W. T. Keener
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