ch35-p107 - 107. (a) Every time one more destructive...

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107. (a) Every time one more destructive (constructive) fringe appears the increase in thickness of the air gap is λ /2. Now that there are 6 more destructive fringes in addition to the one at point A , the thickness at B is t B = 6( λ /2) = 3(600 nm) = 1.80 µ m.
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