Introductory course of natural philosophy for the use of schools and academies. Ed. from Ganot's popular physics. By William G. Peck (1869)
Ganot, Adolphe, 1804-1887, Peck, William Guy, 1820-1892 · New York A.S. Barnes · leaf 347
re, round, triangular, or ob-long. To show this, let us eonsider the case of a beam of solar lightentering a dark room through a hole in a shutter, Fig. 227. Withrespect to the sun, the hole in the shutter is but a point, hence thegroup of rays which enter it form in reality a cone whose base is… … Fig. 227.
Physics
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