Elementary treatise on physics, experimental and applied : for the use of colleges and schools (1906)
Ganot, A. (Adolphe), 1804-1887, Atkinson, Edmund, 1831-1901, Reinold, A. W. (Arnold William), 1843-1921 · New York : Wood · leaf 540
Fig. 469 In determining the extent and the shape of a shadow projected by a body,two cases are to be distinguished : that in which the source of light is asingle point, and that in which it is a body of any given extent. In the first case, let S (fig. 469) be the luminous point, and M a… … Fig. 470 moves round the sphere M tangentially, always passing through the point S,this line will trace a conical surface, which, beyond the sphere, separatesthat portion of space which is in shadow from that which is illuminated. Inthe present case, on placing a screen, PQ, behind the opaque body…
Physics
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