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Waves from two slits are in phase at the slits and travel to a distant screen...

Waves from two slits are in phase at the slits and travel to a distant screen to produce the
second minimum of the interference pattern. The difference in the distance traveled by the
waves is:
A. half a wavelength
B. a wavelength
C. three halves of a wavelength
D. two wavelengths
E. five halves of a wavelength

why A is wrong and show me the steps of the correct one please

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