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... an even number of half-wavelengths.

This becomes confusing when both signals come from the same source,

and the reason for the two different path lengths is that one of them

arrives by way of a single reflection. When that happens, it is an odd

number of half-wavelengths that results in constructive interference,

because the process of reflection introduces an additional half-wave

phase shift in the reflected wave.

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Q: Waves that are emitted in phase from two sources will undergo constructive interference when the paths from the sources differ by?
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