OPTICAL OUTLINES. respouding facts for a concave lens, by which parallel rays are made divergent. Fig. 6. Prismatic elements of a convex lens. Fig. 7. … Prismatic elements of a concave lens. 10. The only ray not refracted by a lens is the one passing thronghthe centre of each surface; compare §2, which is the principal axis, ax, Fig. 8. Secondary axes are Fig. 8. Axes of a lens. rays, such as s. ax, entering and emerging at points on the lens…
Eye · Color blindness · Eye Diseases
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