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Among the two interfering monochromatic sources A and B, A is ahead of B in phase by `66^@`. If the observation be taken from point P, such that `PB-PA=lambda//4`. Then the phase difference between the waves from A and B reaching P is

A

`156^(@)`

B

`140^(@)`

C

`136^(@)`

D

`126^(@)`

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The correct Answer is:
A
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