A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 564
As a rule, the luminous sourceis not very small, so that theshadow has not a sharp boundary.In Fig. 488 the parts of the screenbeyond A and B are fully illu-minated. Within C and D thereis complete shadow, but in theintermediate regions there is onlyhalf shadow, fading gradually fromdense shadow at… … Fig. 487.—Shadow due to a point sourceof light.
Physics
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