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.

Options

A. If `d = lambda//4`, the intensity at P is `4I_(0)`
B. If `d = lambda//6`, the intensity at P is `3I_(0)`
C. If `d = lambda//2`, the intensity at P is`3I_(0)`
D. none of these is true.

Answer

B