. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Parallel rays falling on a plano-convex lens brottght to a focus at the distance of its diameter, arid vice versa. if a double convex lens will bring parallel rays to a focus in the centre of its sphere of curva- ture, it will on the other hand cause rays to assume a parallel direction, which are diverging from its focus ; so that if a luminous body were placed in that point, all its cone of rays, which fell upon the surface of the lens, would pass out in a cylindrical form. Again, if rays al- ready converging fall upon
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Parallel rays falling on a plano-convex lens brottght to a focus at the distance of its diameter, arid vice versa. if a double convex lens will bring parallel rays to a focus in the centre of its sphere of curva- ture, it will on the other hand cause rays to assume a parallel direction, which are diverging from its focus ; so that if a luminous body were placed in that point, all its cone of rays, which fell upon the surface of the lens, would pass out in a cylindrical form. Again, if rays al- ready converging fall upon a convex lens, they Fig. Rays already converging brought to a focus nearer than the centre; and rays diverging from such a point, still diverging in a diminished degree. 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 Todd, Robert Bentley, 1809-1860. London, Sherwood, Gilbert, and Piper
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