Interference Pattern from two coherent light sources

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Can anybody explain why the bright and dark fringes exist during the the interference phenomenon from two coherent sources.. I wanted to know why that specific pattern occurs
 

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Ibix
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For a question that general, the answer would be that you get bright fringes where the waves are in phase and dark fringes where they are out of phase, and to see a textbook for details. The explanation on Wikipedia looks reasonable.

https://en.m.wikipedia.org/wiki/Wave_interference
 
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