Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 321
axis; then,making the angle CRS = angle CRQ,we have the reflected ray RS. Butsince QR is parallel to AC, angle CRQ= ano-le RCF. Hence angle FRC =angle FCR, and the sides FR, FC areequal. Now if R is not far from A, the vertex, FR and FA arenearly equal, and hence AF is approximately equal to FC,… … It is evident, then, that a beam of rajs Aparallel to the principal axis, striking themirror near the vertex, will be converged „„,„., Fig. 346.—A beam of ravs by the concave mirror to a point F, mid- parallel to the principal axis •z ^ passes, on reflection, through way between A and C. This point…
Physics
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