OPTICAL OUTLINES. cither surface of the lens, ?'. e.,f=:r, the radius; in jdauo- convcx, or concave, lenses /"=2r. 16. Images The image formed by a lens consists of foci, each of which corresponds to a point on the object. Given the foci of the boundary points of an object, we have the position and… … Real inverted image formed by a convex lens. allel to the princi})al axis, and therefore passing after re- fraction through the principal focus /^ These two rays, and all others which pass through the lens from the point a, will meet at a the conjugate focus of a. Similarly the focus of the point h…
Eye · Color blindness · Eye Diseases
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