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I hope I'm posting in the right place!

In the destructive interference of waves and solving for the path difference, I"m confused at when we should use m+1/2 vs. m-1/2 ( so the eq'n is PD=(m+1/2)lambda or PD=(m-1/2) lambda

Any insight would be greatly appreciated! :)

thanks!!

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# Destructive Interference and path difference

**Physics Forums | Science Articles, Homework Help, Discussion**