In a single slit Fraunhofer diffraction device, the dissymmetry distributing diffraction pattern can be seen on the screen by turning one edge of the single slit and fixing another.

利用单缝夫琅和费衍射装置，通过转动使组成狭缝的一棱边与另一固定棱边形成分离间隙，进而使观察屏上的衍射条纹出现不对称分布现象。