Duff, A. Wilmer (Alexander Wilmer), b. 1864, ed, Guthe, Karl Eugen, 1866-1915, Hallock, William, 1857-1913, Lewis, E. Percival (Exum Percival), 1863-1925, Goodspeed, Arthur W. (Arthur Willis), b. 1860, Carman, Albert Pruden, b. 1861, McClung, Robert Kenning, 1874- · Philadelphia, P. Blakiston's Son & Co · leaf 350
rce, for example, a candle, is placed opposite sucha hole in a screen S^ (Fig. 204) light from the point P will passthrough the opening in a narrow cone or pencil and illuminatea small patch at P^ on a screen S„. Light from Q will form a smallpatch at Q3, and light from any other point of the flame… … image like that due to a condensing lens, but the total light in thepinhole image will be less than that formed by the lens in the pro-portion of the area of the pinhole to that of the lens. As theimage is due to a group of overlapping patches, it will not be sosharp in outline as that made by the…
Physics
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