An interference pattern shows bright fringes separated by 1.5mm on a screen 2.5m from the openings. The light has wavelength 632nm. Two possible setups are proposed: (i) a double slit with d=1.0mm or (ii) a diffraction grating with 600 lines per millimeter. Determine which setup is more consistent with the observed fringe spacing and support your choice with a quantitative comparison.