Phillips, Percy · London : T. C. & E. C. Jack ; New York : Dodge Pub. Co. · leaf 66
three equal parts by Dand E, BR will be half a wave-length longer than DR,DR half a wave-length longer than ER, and ER half awave-length longer than AR. Two of these portionsof the slit will mutually destroy one anothers effect,leaving the third portion effective. We shall thereforehave a bright… … 64 THE SCIENCE OF LIGHT destructive pairs of quarters, and therefore anotherdark band results. Further out still we reach a pointwhere the distances from A and B differ by two and ahalf wave-lengths, and then the slit may be divided intofifths, of which two pairs are mutually destructive, leav-ing…
Light
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