Elementary natural philosophy : designed for high schools and academies (1881)
Griffin, La Roy F. (La Roy Freese), 1844-1916 · Philadelphia : Sower, Potts & Co. · leaf 195
*This and all the views of shadows are shown in plane section. LAWS OF INTENSITY. 185 Diameter. This is a purely hypothetical case, and is deter-mined like case second. The Umbra is a cylinder. … 657. IT. The Luminous Body Larger than the Opaque. The Umbra and Penumbra are determined as before. But now the apex of the cone isbeyond the opaque body, atP, Fig. 206, and the Umbraconstantly diminishes in di-ameter until it reaches theapex. The Penumbra in-Fig. 206. creases and extends to an…
Physics
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