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(1) é³éļ¼\(\lambda = 2(l_2 - l_1)\) 㨠\(V = f\lambda\) ć使ćć
(2) éå£ē«Æč£ę£ļ¼1åē®ć®å
±é³“ \(l_1 + \Delta = \lambda/4\) ćć \(\Delta = \lambda/4 - l_1\)ć
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