A general geometry and calculus : including book I. of the general geometry, treating of loci in a plane; and an elementary course in the differential and integral calculus (1881)
Olney, Edward, 1827-1887 · New York : Sheldon and Co. · leaf 187
flected raysproduce a luminous curve, called a Caustic^which is an example of the envelope dis-cussed in the problem. The annexedfigure affords an illustration. Let NANbe a section of a circular cylindrical mir-ror, made perpendicular to its axis. Let1 to 11 be rays of light parallel to theaxis of… … Fio. 171. 158 PROPERTIES OF PLAISE LOCI. on a table in the light. It is famihar to the milkman, as **the cows footin the milk, which is the caustic formed upon the smooth surface of themilk in a bright tin pail, by reflection of the Hght from the inside of thepail. Ex. 1. To produce the equation of…
Geometry, Analytic · Calculus
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