Brewster, David, Sir, 1781-1868, Bache, A. D. (Alexander Dallas), 1806-1867 · Philadelphia : Lea and Blanchard · leaf 64
round.These luminous intersections form curve lines, called causticlines or caustic curves; and their nature and form will, of * See (in the College edition) the Appendix of Am. ed. chap. v. CHAP. VI. CAUSTIC CURVES. 59 course, vary with the aperture of the mirror, and the distanceof the radiant… … rays is F. Let RMB be a diverging beam of light fallingon the upper part, M B, of the mirror at the points 1, 2, 3, 4,&c. If we draw lines perpendicular to all these points fromthe centre C, and make the angles of reflexion equal to theangles of incidence, we shall obtain the directions and…
Optics
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