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Two source interference constructive interference ------destructive interference ------- Two source interference Path difference = S2P – S1P = 1 wavelength = P constructive interference ------destructive interference ------- S1 S2 Two source interference Path difference for constructive interference = n (where n is an integer) 0 2 3 constructive interference ------destructive interference ------- Two source interference Path difference for destructive interference = (n + ½) (where n is an integer) ½ 1½ 2½ constructive interference ------destructive interference ------- Free powerpoints at http://www.worldofteaching.com Two source interference The path difference is • n for constructive interference • (n + ½) for destructive interference This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.