光在一定条件下能发生干涉,是因为光是一种波,当然也就具有波的共性,遵守波的迭加原理,它表明:如果两列波同时作用于某一点上,则该点的振幅等于每一列波单独作用时所引起的振动的代数和,可能是大于、等于或小于分波的强度。这就是说,两波迭加与它们之间的位相差有密切关系,对两列同相位的正弦波,迭加以后的迭加波的频率和位相与原来的波一样,振幅是原来波振幅之和;对位相相反的两波,迭加以后频率不变,迭加波的振幅为原来波振幅之差,即相互抵 Light can interfere under certain conditions because light is a wave and, of course, it has the same wave nature and obeys the principle of superposition of waves. It shows that if two waves simultaneously act on a certain point, The algebraic sum of amplitudes equal to the vibrations caused by each wave alone may be greater than, equal to or less than the intensity of the sub-wave. This means that the two wave superposition is closely related to the phase difference between them. For two series of sine waves with the same phase, the superposed wave frequency and phase after superposition are the same as those of the original wave. The amplitude is the amplitude of the original wave And; on the opposite phase of the two waves, superimposed on the same frequency, superimposed wave amplitude of the original wave amplitude difference, that is, each other