So let's think of them a little bit more by graphing the amplitude of the wave, and seeing how we can have this constructive interference.
让我们把波的,振幅画出来考虑一下,我们怎么能得到这种相长干涉。
sa So we have 1 s a, and we're drawing this as having a positive amplitude, but since we have destructive interference we're going to draw 1 s b as having the opposite sign, so we have a plus and a minus in terms of signs.
我们有,我们把这画成一个正的振幅,但因为我们是相消干涉,我们把1sb画成相反的符号,所以我们有一正一负两个符号。
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