A text-book of physics, largely experimental. On the Harvard college "Descriptive list of elementary physical experiments." (1891)
Hall, Edwin Herbert, 1855-1938, Bergen, Joseph Y. (Joseph Young), 1851-1917 · New York, H. Holt and Company · leaf 220
age-point 3, in the diagram made in Exercise 29,and try them in the formula, with the known value of F. 170. Spherical Aberration in Lenses.—Not all the raysgoing from a point 0 to a lens A converge, after passingthrough the lens, to a single point /. Those which gothrough the lens near its margin… … FIG. 141. 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…
Physics
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