Question

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∘. 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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Solution

The correct option is **A** 2 : 1 : 0

Since P is ahead of Q by 90∘ and path difference between P and Q is λ4. Therefore at A, phase difference is zero, so intensity is 4I. At C it is zero and at B, the phase difference is 90∘, intensity is 2I.

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