Brewster, David, Sir, 1781-1868, Bache, A. D. (Alexander Dallas), 1806-1867 · Philadelphia : Lea and Blanchard · leaf 404
in the equation which concludes art. 30, namely, r v — . cos. <p. 2 To construct this value of v; let fall from C, OF perpendicularto the reflected ray LB, then LP = LC . cos. <p = r. cos. f, whence,2 CHAP. V. CAUSTICS BY REFLEXION. 75 Bisect LC in E, and LP in F, then LFE is a right angle;… … diameter of the generating circle of which is equal to the radius ofthe base; this latter being half the radius of the mirror. Tins curveand the circle LDM revolving about DC, as an axis, would gene-rate, respectively, the surface of the caustic and that of the mirror. Second. Let the radiant point…
Optics
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