Brewster, David, Sir, 1781-1868, Bache, A. D. (Alexander Dallas), 1806-1867 · Philadelphia : Lea and Blanchard · leaf 45
The method of tracing the progress of a ray whichenters a convex surface, is shown in Jig-. 26. for the ray H R,and of tracing one entering a concave surface of a rare me-dium, or quitting a convex surface of a dense one, is shownfor the ray R r, in the same figure. When the ray enters the concave… … with two concave surfaces, or a thick concave lens. Let C, Cbe the centres of the two surfaces lying in the axis C C, andH R, H R parallel rays incident on the first surface. As C Ris perpendicular to the surface at R, H R C will be the angleof incidence; and if a circle is described with a radius…
Optics
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