Anatomy and physiology of the eye, with hints for the preservation of the eyesight (1901)
Herbert, John Frederick, 1860- · Philadelphia, Pa., The author · leaf 55
equal to theangle of incidence. It may be likened to the action of abilliard ball when it strikes a cushion—always glancingoff at an equal angle to the original course. See figure 28. 49 SPfiCTACLE LENSHS. All ordinary lens or prism is composed of a piece ofglass or other transparent substance, so… … Figure 29. A. Bi-couvex or double convex. B. Plano-convex. C. Concavo-convex. I>. Bi-concavc or double concave. E. Plano-concave. 1. Convexo-Concave. G. Piano-prism. minus. The prefix sign ! is used to designate the formerand the prefix sign — the latter. Rays of light, when passing through a…
Eye · Lenses
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