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Four monochromatic and coherent sources ...

Four monochromatic and coherent sources of light emitting waves in phase at placed on y axis at y = 0, a, 2a and 3a. If the intensity of wave reaching at point P far away on y axis from each of the source is almost the same and equal to `I_(0)`, then the resultant intensity at P for `a=(lambda)/(8)` is `nI_(0)`. The value of `[n]` is.
Here [] is greatest integer funciton.

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