An easy way to distinguish whether the fringe pattern is the result of a single slit diffraction or from a double slit interference is the intensity for each fringe is much stronger for a single slit than a double slit. the intensity for each fringe is much stronger for a double slit than a single slit. that there are many more fringes from a double slit than a single slit. that there are many more fringes from a single slit than a double slit. the width central maximum from a single slit is twice the width as the other width, whereas the widths of the fringes from a double slit are about the same width.