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Gilbert light experiments for boys (1920)
Lynde, Carleton John, b. 1872, Gilbert, Alfred C. (Alfred Carlton), 1884-1961 · New Haven, Conn. : A.C. Gilbert Co. · leaf 72
Fig. 107 (1). How parallel rays are converged by aconcave lens and diverged by a convex lens … Fig. 107 (2)Light · Scientific recreations
Internet Archive · Getty Research Institute · Public Domain Mark 1.0. Free to use for anything.
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