ter, fis-sures in the interior of crystals, etc. In all such cases, it isfound that there are two reflecting surfaces separated by avery small distance, and the interference is between the lightreflected from the first surface and that reflected from thesecond. It is further necessary, if the… … Figure 80 a room, or a broad flame, giving out light in all directionsfrom every point of it. We shall first suppose that the film has plane and parallelsurfaces, so that it is of uniform thickness. Let AB and CD,figure 80, represent the upper and lower surfaces of suoh, a 154 LIGHT film, and E the…
Light
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