A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 587
sake of clearness, the rays in one halfonly are shown. The outer parts of the caustic are faint, and it will be noted onexamining Fig. 509 that the outer parts are due to rays reflectedfrom the larger parts of the mirror lying between A and L and betweenM and B. If these parts be removed, the… … Fig. 509. Caustic by reflection at sphericalsurface. PARABOLIC MIRROR 563 Parabolic mirror.—A spherical mirror does not bring a beam toa point focus unless it is confined to a small area. In the event ofit being desired to bring a large beam to a point focus, it is necessaryto use a parabolic…
Physics
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
