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Given an interference pattern which is the exact opposite of the interference pattern of the double split experiment (points where delta r = nλ (n=0,1,2,...)are totally dark and points where delta r = l/2 λ (l=1,3,5, ...) are brightest, with r being the path difference). How do the 2 waves look like and how can they be produced?

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  • $\begingroup$ Hint: how can there be destructive interference if the path lengths are equal? $\endgroup$ – Jasper Aug 25 '18 at 19:48
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One way to do it is to put a half-wave retarder plate in front if one slit. That will move the interference fringes by 1/2 space

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