衍射是波能够绕过障碍物而传播的现象，也是波动所共有的特征。光的衍射现象对建立光的波动学说起了重要作用。单缝衍射条纹的宽度与狭缝宽度成反比，与波长成正比。中央亮条纹的宽度为其它亮条纹宽度的二倍。
可以看出，不同颜色光由于其衍射角不同。明暗条纹的位置和间距不同。
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