If two light waves are coherent, the waves have the same frequency, and the peaks and troughs of light waves are exactly aligned with one another.
如果两束光是相干光，那么它们具有相同的频率，并且相互间的波峰和波谷步调一致。
Light that is of one frequency, with the waves in step is called coherent light.
单频率且波同步的光叫相干光。
Light that is of one frequency, with the waves in step is called coherent light.
单频率且波同步的光叫相干光。
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