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 425
of a wire or needle cast by a linear sourcesimilar fringes are observed. (See Fig. 9 showing shadow of needlesof different sizes.) 469. Resolving Power. If light from a narrow slit passesthrough another slit to a screen the central maximum may be re-garded as an image of the first slit… … Fig. 289. sources through circular openings. If we look through a smallpin-hole at a distant light it will appear much larger than whenviewed with the naked eye. The filament of a lamp appearsthicker when seen through a narrow slit. If an image is formedby a lens or mirror the same conditions hold…
Physics
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