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 427
it is physically impossible for small insectsto see details clearly. To them an incandescent filament mustappear as it does to us when we look at it through a very smallpin-hole. 470. Diffraction Grating. If there are a number of narrow andequidistant parallel openings in a screen each pair of… … Fig. 292. exist between any pair of adjacent parallel rays. If a is the dis-tance between openings and if the angle between OPg and OP^ isa (measured from the lens L), the common difference of path isa sin a, and the condition that there shall be a maximum at P^ forthe wave length X is a sin a = n\…
Physics
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
