The elements of natural philosophy : copiously illustrated by familiar experiments and containing descriptions of instruments, with directions for using : designed for the use of schools and academies (1856)
Sprague, A. W. (Alfred White), 1821-1891 · Boston : Phillips, Sampson & Company · leaf 294
a point or luminary smaller than theopaque body, the shadow will divei-ge as it recedes from thisopaque body ; but if the luminary be larger than the opaque body,the shadow will converge, and terminate in a point at a greateror less distance from the body. 264. Shadoiu and Penumbra. — If the… … luminary, and 0 a smaller opaque body, behuiu wuiuu is lormedthe true shadow terminating at t. From the space occupied bythis true shadow the whole of the light from S is excluded, but A beam of light. How does light from a luminous body proceed? What issaid of the form of the shadow ? What will be…
Physics
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