Figure here shows P and Q as two equally intense coherent sources emitting radiations of wavelength 20 m . The separation PQ is 5.0 m and phase of P is ahead of the phase of Q by 90 o . A , B and C are three distant points of observation equidistant from the mid-point of PQ . The intensity of radiations at A , B , C will bear the ratio
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Since P is ahead of Q by 90 o and path difference between P and Q is 
Therefore at A , phase difference is zero, so intensity is 4 I . At C it is zero and at B , the phase difference is 90 o , so intensity is 2 I .
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