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Two wavelengths \(\lambda_1\) and \(\lambda_2\) are used in Young's double slit experiment. \(\lambda_1=450 \mathrm{~nm}\) and \(\lambda_2=650 \mathrm{~nm}\). The minimum order of fringe produced by \(\lambda_2\) which overlaps with the fringe produced by \(\lambda_1\) is \(n\). The value of \(n\) is _______.

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