Between 1/4 and 1/2-wavelength spacing the pattern narrows, but side lobes (interference patterns, caused by destructive interference) do not appear until the spacing is greater than 1/2 wavelength.

• 在1/4波长和1/2波长之间是不会出现旁瓣（副极大值，干涉波形，通常是由破坏性的干涉导致）的，这一现象会持续直到间距大于1/2波长。