Carhart, Henry S. (Henry Smith), 1844-1920 · Boston : Allyn and Bacon · leaf 264
REFLECTION AND REFRACTION. 253 … focus F; the ray ^LOis reflected directly back on its ownpath. The intersection of these two reflected rays is at #,and a is therefore the focus conjugate to A. In the sameway the two rays BE and B C intersect after reflection at6, the conjugate focus or image of B. Therefore ab is theimage of AB.…
Physics
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