Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 321
FiQ. 345.—The ray QR, parallelto the principal axis AC, onreflection passes through theprincipal focus F. … 356. Principal Focus. In Fig. 345 let QR be a rayparallel to the principal axis; then,making the angle CRS = angle CRQ,we have the reflected ray RS. Butsince QR is parallel to AG, angle CRQ= angle RCF. Hence angle FRG =angle FOR, and the sides FR, FO areequal. Now if R is not far from A, the…
Physics
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