Lynde, Carleton John, b. 1872 · New York, Macmillan · leaf 263
is caught on a second screen placed two feet from O.It covers an area E F G H which has four times the area of thesquare hole. Since the light covers four times the area, it isonly one fourth as intense on any one area. That is, the light 248 PHYSICS OF THE HOUSEHOLD at a distance of two feet is… … FlG. 178. — The intensity of light varies inversely as the square of the distancebetween the source of light and the object illuminated. ninth as great. That is, the intensity of the light on an objectvaries inversely as the square of the distance between the objectand the light. Candle power of a…
Physics · Home Economics
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