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
Fig. 207. point. In the same way, rays start from B, pass the aperture and form the point at b. Sim-ilarly, rays start from all the intermediate points and form theimage of the entire object in an inverted position 659. Laws of Intensity. Since light is a radiant force,it conforms to the general… … 186 OPTICS.
Physics
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