. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. n Fig. rays at extremities of the lens are shown to be dis- persed, the violet rays forming a focus at b, the red at r, and the rays of the spectrum between the red and violet being disposed regularly between r and 6. If the light has proceeded from an object, no proper white image will be formed, but, instead, circles of colour will. Fig. 153.—Chromatic Aberration. surround the object, which, if placed at b, will have a central circ
. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. n Fig. rays at extremities of the lens are shown to be dis- persed, the violet rays forming a focus at b, the red at r, and the rays of the spectrum between the red and violet being disposed regularly between r and 6. If the light has proceeded from an object, no proper white image will be formed, but, instead, circles of colour will. Fig. 153.—Chromatic Aberration. surround the object, which, if placed at b, will have a central circle of violet changing gradually till the outer ring of the circle is red ; and, if placed at r, will have a central circle of red, changing gradually through the colours of the spectrum to violet. This is called chromatic aberration. This property of lenses seemed at first to offer an insuperable obstacle to the employ- ment of lenses for magnifying purposes, since, owing to it, no clear definition of an object could be obtained ; and it seemed impossible to obtain, a lens which would. 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 M'Gregor-Robertson, J. (Joseph), 1858-1925. Philadelphia, H. C. Lea's son & co.
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