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How do I work out what m value (0, 1/2, 1 etc) to put in the thin film interference equations like 2nt = (m + 1/2)*lambda? Does it depend if it's constructive or destructive? Could someone help explain, thanks!
Wait, this is not right. There are destructive interference in thin-film interference. That's the whole point of anti-reflective coating!No, it's always constructive. The question is what path difference causes constructive interference.