The flash makes the two alternative pathways distinguishable, which destroys the superposition, and the particles arrive at the final screen not in a pattern of fringes but in one featureless blob.

• 这些闪光使得两条不同的路径得以被区分，而破坏了叠加，于是粒子到达最后一道屏幕时，就不会形成具有条纹的图样，而是内无特徵的圆点。