Lynde, Carleton John, b. 1872, Gilbert, Alfred C. (Alfred Carlton), 1884-1961 · New Haven, Conn. : A.C. Gilbert Co. · leaf 24
Fig. 28. The spot is dark by re-fleeted light Fig. 27. The light is one-ninth as strong onB as on A when B is 3 feet from the candle square inches. Place A 1 foot fromthe candle and B 2 feet. Does thelight which passes through 1square inch in A cover 4 squareinches on B? Is it, therefore,…
Light · Scientific recreations
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