International Library of Technology · Scranton, International Textbook Co. · leaf 214
of light, such, for example, as a candle andan incandescent lamp, and that we wish to compare thebrightness of these two sources. If the candle A and thelamp B are placed in a dark room, so that there will be noother light to interfere, and a screen C is placed betweenthem, as shown in Fig. 11, one… … FIG. n. illuminated when placed midway between them. If thescreen is mounted so that it can be slid along between thelights, a point can always be found where the screen will beequally illuminated on both sides. In the present case, thescreen would have to be moved nearer the candle than thelamp,…
Electrical engineering
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