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)
ball is placedto the light. If the luminous body is a mere point, the body will cast a well-defined shadow upon the screen. If either of the straight diverginglines be carried around the sphere, L, touching it all the way, it willmark the exact limits of the shadow cast by the sphere, which,… … 528. Figure 45.—Shado-ws of bodies smaller than theilluminating body.—When the luminous body, 8, is larger than 29i OPTICS. the opaque body, E, the shadow will gradually diminish in size untilit terminates in a point. The shape of the shadow of a spherical bodywill be that of a cone, T. The length…
Physics · Astronomy
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