Natural philosophy. being a hand-book of chemical physics, or, The physics of heat, light and electricity (1869)
Sangster, John Herbert, 1831-1904 · Montreal : J. Lovell · leaf 87
) 201. Two waves do not interfere if they mee after they havetravelled through parts of equal lengths, or through paths thatdiffer in length by 1, 2, 3, 4, 5, &c., entire waves. 202. Two waves interfere when they have travelled throughunequal paths, the inequality in length not being 1, 2, 3,… … 203. Some idea of the mode in which the wave lengths of lighthave been determined may be gathered from the following experi-ment. Through a pin-hole, s, Fig. 21,in the shutter of a darkened room, allowa sunbeam to enter, and at a short dis-tance from the aperture place a thinwire, a b, (seen…
Physics
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