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Unformatted text preview: 12. Here we refer to phase diﬀerence in radians (as opposed to wavelengths or degrees). For the ﬁrst dark
fringe φ1 = ±π , and for the second one φ2 = ±3π , etc. For the mth one φm = ±(2m + 1)π . ...
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- Fall '08