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 367
on of waves through S*! and S^. The first wave from S throughSi reaches Pi at the same instant that the second wave from 5 throughS2 reaches that point. If only one wave were to come from S the resultantsingle waves from Si and 5*2 would reach P at different instants and couldnot interfere. If x =… … Fig. 214. right angle (this is very nearly true if b is very small) we have very nearly b : \ = Lo : X since, because the angle a is very small, Lo is very nearly equal to L^.Therefore, Z X =^ - — A./> This expression gives the width of a band of wave-length X. For agiven screen distance this…
Physics
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