Hall, Edwin Herbert, 1855-1938 · New York, H. Holt and company · leaf 162
made in Exercise 25,and try them in the formula, with the known value of F, REFRACTION OF LIGHT. 149 147. Spherical Aberration in Lenses.—All the rays goingfrom a point 0 to a lens A do not, after passing throughthe lens, converge to a single point 7. Those which gothrough the lens near its margin… … plate with a hole which permits only those rays to passwhich are near the principal axis of the lens. Lenses can be so constructed, with surfaces not quitespherical, as to do away with this defect in great part, forlight of any one color, but such lenses are difficult to makeand are uncommon except…
Physics
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