Elementary treatise on physics experimental and applied for the use of colleges and schools (1890)
Ganot, A. (Adolphe), 1804-1887, Atkinson, E. (Edmund) · New York : W. Wood · leaf 508
s make with thenormal to the illuminated surface. In order to demonstrate the first law, let there be two circular screens,CD and AB (fig. 445),.one placed at a certain distance from a source of light, L, and the other atdouble this distance, andlet J and S be the areasof the two screens. Ifa be… … falls on the unit of surfa Now as the triangles ALB and CLD are similar, the diameter of AB isdouble that of CD ; and as the surfaces of circles are as the squares of their diameters, the surface S is four times j, consequently the intensity -^ is one-fourth that of .s The same law may also be…
Physics
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