Lynde, Carleton John, b. 1872, Gilbert, Alfred C. (Alfred Carlton), 1884-1961 · New Haven, Conn. : A.C. Gilbert Co. · leaf 72
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 … Fig. 107 (1). How parallel rays are converged by aconcave lens and diverged by a convex lens
Light · Scientific recreations
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