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Dr suman 1
interference will observed definitely..As the number of slits increases, more secondary maxima appear, but the principal maxima shows, a dark fringe is located between every maximum (principal or secondary). As N grows larger and the number of bright and dark fringes increase, the widths of the maxima become narrower due to the closely located neighboring dark fringes.
who said interference will not observe
in n slit diffraction
yes, interference will observed even with more bright fringes