Phillips, Percy · London : T. C. & E. C. Jack ; New York : Dodge Pub. Co. · leaf 72
n the brightmain bands. If we have eight equidistant slits we candivide them into pairs, 1 and 5, 2 and 6, 3 and 7, 4 and 8,which are four times as far apart as AB, and these willtherefore produce darkness at a point only a quarter asfar as Q from P. The intensity of the central bandtherefore falls… … (Distance from P Fig. 40. bands in between the bright ones. Every increase inthe number of equidistant slits leads to a narrowing ofthe bright band and a broadening of the dark space inbetween, until when the number of slits is very largethe bright bands are sharp narrow lines separated bybroad…
Light
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