Practical Meteorology Being a Guide to the Phenomena of the Atmosphere And Th
Practical Meteorology Being a Guide to the Phenomena of the Atmosphere And Th
J John Scoffern
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The operation of this law is illustrated by the preceding diagram, wherein the figures 1234 represent four distances from a luminous object ; the intensity of light at 2 will be one-fourth the intensity of the same at 1 ; at 3, one-ninth ; and at 4, one-sixteenth. If a in the preceding body be conceived to stand for an opaque screen, having determi- nate square divisions say one foot and 234 other opaque screens, having the respec- tive dimensions of four, nine, and sixteen feet, then at positi...on 1 the one-foot screen will intercept all the light, at 2 the four-feet square screen, &c. Law II. When a ray of light falls on a reflective surface, the reflected and the incident ray are both in one plane. Thus, in the annexed diagram, m ip represents a reflective plane, d an incident ray, n a reflected ray, and i the point of impact ; thus the rays d and n lie in one and the same plane. Law III. The angle of incidence and the angle of reflection are equal. Thus, referring to the subjoined diagram (Fig.
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