CONJUGATE FOCI
\kˈɒnd͡ʒuːɡˌe͡ɪt fˈə͡ʊsa͡ɪ], \kˈɒndʒuːɡˌeɪt fˈəʊsaɪ], \k_ˈɒ_n_dʒ_uː_ɡ_ˌeɪ_t f_ˈəʊ_s_aɪ]\
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Two points of such a position that light rays emanating from one are collected by a mirror or lens at the other. Conjugate foci are mutually convertible, i. e., either one may be taken as the point of emanation of the rays or vibrations, and also as the point of collection of the latter.
By Smith Ely Jelliffe
Word of the day
Health Personnel Attitudes
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