Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
shines through. Of course,the relative intensities of the two lights, as before, will be as the squaresof their distances from the disk. 529. Figure 60.—Intensity of light at different dis-tances.—It can be shown, mathematically, tluit the intensity of light,coming from the same source, varies… … double the distance, and three feet square at tliree times the distance,and so on (448). The areas of these shadows will be as the square oftheir distances from the luminous point, or as 1^, 2^, 3^, etc., or as1, 4, 9, as shown in the diagram, by the dotted lines. But as no morelight would occupy…
Physics · Astronomy
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