Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 197
Fig. 21G. intensity, two curves of different brightness are produced. Thelights are then moved until they are uniform and the distance ofthe lights measured. Their intensity is then determined by Jhelaw of inverse squares. The curves are shown at the right. I 188 OPTICS. CHAPTEK II. INTERCEPTION OF…
Physics
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