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i think i have done something wrong or the values have one zero less, plz. check for destructive interference at point P ( pinhole) , the path diff. = delta (P) = (2n-1) lambda / 2 assuming sin theta = theta = tan theta d* ( 2 mm ) / D = delta (P) = ( 2n - 1) lambda /2 ( 4 mm ) * 10^-5 m / 1 m = ( 2n-1 ) lambda 400 Angstrom / ( 2n-1) = lambda , so the missing wavelength is 400 angstrom because only n=1 is a solution as other wavelengths make it out of range of white light