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)
rness of vision in the higher regions ofthe atmosphere, that it becomes exceedingly diffi-cult to judge of distances. 362. Figure 1. —Rays, pencils, andbeams of light.—A single line of light iscalled a ray. A pencil of light is a collection of rays divergingfrom or converging to a common point, as… … 204 OPTICS. S63. Figure 2.—Visible bodies emit light from every point, and in every direction, Fig. 2.
Physics · Astronomy
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