Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 47
be placed in the principalfocus of a double-convex lens, its divergent rays, falling on onesurface of the lens as a cone, will pass forth from its other side asa cylinder. If, however, the rays which fall upon a double-convexlens be diverging from the farther extremity of the diameter of itssphere… … Eays diverging from the farther extremity of one diameterof curvature of a double-convex lens, brought to a focus atthe same distance on the other side. the farther removed from the other side will be the point of con-vergence (Fig. 5), until, the point of divergence being at the centre,. Fig. 5.
Microscopy · Biology
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