Brewster, David, Sir, 1781-1868, Bache, A. D. (Alexander Dallas), 1806-1867 · Philadelphia : Lea and Blanchard · leaf 404
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… … The ray RL is reflected into LB. To find the position of Fupon LB, we recur to equation (11), art. 29. JB^Bg^BMBWiW^^^gggg^l awww SB 76 GENERAL EQUATION OF CAUSTIC CURVE. APPENDIX — 4- — 2 r . cos. <pDrawing CP perpendicular to UL, LP = r. cos. <p, whence,1 _ _2_ _£_ l 3 7,C3 CL If CJ3 be…
Optics
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-214-129.webp)
