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Consider the interference at P between waves emitting from three coherent sources in the same phase located at `S_(1)` , `S_(2)` and `S_(3)` . If the intensity due to each source is `I_(0)=12Wm^(-2)` at P and `(d^(2))/(2D)=(lamda)/(3)` then what will be the resultant intensity `(in Wm^(-2)` ) at P?

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