Wright, Mark R., 1854- · London : Longmans · leaf 99
minates Si, and the lamp illuminates S2. Thequantities of light received at Si, Sj (fig. 63, b) are equal. By thelaw of inverse squares, the illuminating power of the lamp isto the illuminating power of the candle as the squares of theirdistances from S2 and S|. In an experiment Lj s, was 12, and… … -<J (rjj Fig. 63. Bunsens Grease-spot Photometer.—A circular piece ofwriting-paper, stretched on a simple frame, has a, small grease-spot made in the centre with a drop of wax from a candle.When both sides of the paper are equally illuminated the spotbecomes invisible. Arrange a gas flame or…
Physics
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