. The microscope; an introduction to microscopic methods and to histology. Microscopes. 282 IMAGES FORMED BY LENSES [Ch. IX thin in the middle and thick on the edge they make the light rays entering them more divergent. In a word, then, thin edge lenses are called convergent, and thick edge ones, divergent lenses. This follows inevitably from the rule that on entering a denser medium. Fig. 165-166. To Show the Formation of-a Reduced Virtuax Image by A Concave Lens, and that the Image is Larger the Nearer the Object Is to the Principal (Virtual) Focus. (Compare Fig. 86-87). any oblique ray of l
. The microscope; an introduction to microscopic methods and to histology. Microscopes. 282 IMAGES FORMED BY LENSES [Ch. IX thin in the middle and thick on the edge they make the light rays entering them more divergent. In a word, then, thin edge lenses are called convergent, and thick edge ones, divergent lenses. This follows inevitably from the rule that on entering a denser medium. Fig. 165-166. To Show the Formation of-a Reduced Virtuax Image by A Concave Lens, and that the Image is Larger the Nearer the Object Is to the Principal (Virtual) Focus. (Compare Fig. 86-87). any oblique ray of light is bent toward the normal, and on leaving it for a rarer medium, it is bent from the normal (§ 446.) § 457. Principal features of spherical lenses — (i) Principal axis. This is the straight Une passing through the lens and joining the centers of the two spheres contributing to the formation of the lens ( 167, 4c c'). (2) Optic center. The point in a lens or near it through which light rays pass without angular deviation. That is, the ray. 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 Gage, Simon Henry, 1851-1944. [Ithaca, N. Y. The Comstock publishing company
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