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 548
e. In order to demonstrate the first law, let there be two circular screens,CD and AB (fig. 480), one placed at a certain distance from a source oflight, L, regarded as a point, and the other at double this distance, and lets and S be the areas of the two screens. If a be the total quantity of… … Fig. 480 AB is 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 s, consequently the intensity is one-fourth that of . Fig. 480 shows that it is owing to the…
Physics
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
