Lynde, Carleton John, b. 1872, Gilbert, Alfred C. (Alfred Carlton), 1884-1961 · New Haven, Conn. : A.C. Gilbert Co. · leaf 72
GILBERT LIGHT EXPERIMENTS 69 … Fig. 106. (1) Parallel waves are curved in. (2) Parallel waves are curved out ular radii and cross at the focus F. The line through the centerO of the mirror and through the center C of the sphere is calledthe principal axis of the mirror. You will notice that the parallel
Light · Scientific recreations
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