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Unformatted text preview: 48. We note that the central diffraction envelope contains the central bright interference
fringe (corresponding to m = 0 in Eq. 36-25) plus ten on either side of it. Since the
eleventh order bright interference fringe is not seen in the central envelope, then we
conclude the first diffraction minimum (satisfying sinθ = λ/a) coincides with the m = 11
instantiation of Eq. 36-25:
= 11 a .
Thus, the ratio d/a is equal to 11. ...
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