Gage, Alfred P. (Alfred Payson), 1836-1903, Fessenden, C · Toronto : W.J. Gage · leaf 364
y are called conju-gate foci. Conjugate foci are ttvo points so related that theimage of one is foi-mecl at the other. The rays EA and EBenianatiug from E are less divergent than rays FA and FB,emanating from a point F less distant from the mirror, andstriking the same points. Rays emanating from… … FORMATION OF IMAGES. 341 rays may be regarded as practically parallel when their sourceis at a very great distance, e.g., the suns rays. If a sunbeam,consisting of a bundle of parallel rays, as E A, D G, and H B(Fig. 249), strike a concave mirror parallel with its principal249 axis, the} become…
Physics
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