Natural philosophy. being a hand-book of chemical physics, or, The physics of heat, light and electricity (1869)
Sangster, John Herbert, 1831-1904 · Montreal : J. Lovell · leaf 126
inear or IGOO superficial powers. SPHERICAL ABERRATION. 288. The rays refracted from a convex or concave surface donot all meet in the same point, but those which enter the lens atits principal axis are refracted to a focus more remote or nearerthe lens that those which enter at its edge. This… … C k and D p be inci-dent upon the lens gvery near its princi-pal axis, ^ m n F,and let F be their A D focus after refrac-tion ; also let 5 iand jE Z be incidentnear the edge of the lens ; it will be found upon tracing theircourse by the rules before laid down, that they meet in a focus,/, much…
Physics
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