Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
d their reflected rays, to F, form equal angles withthe dotted perpendiculars. 389. Figure 19.—Foci of concave mirrors for divergentrays.—If the rays of light emanate from some point of the axis, as A, OPTICS. 215 not infinitely distant from the mirror, they will be brought to a focus,after… … The point, A, and the point where its reflected rays meet the axis,are called the conjugate foci. Conjugate foci, therefore, are any twopoints so related that a pencil of light, tminating from either one, isbrought to a focus at the other. The one from which the lightemanates, as A, is called the…
Physics · Astronomy
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