Among the two interfering monochromatic sources \( A \) and \( B ; A \) is ahead of \( B \) in p...
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1Among the two interfering monochromatic sources \( A \) and \( B ; A \) is ahead of \( B \) in phase by \( 66^{\circ} \). If the observation be taken from point \( P \), such that \( P B-P A=\lambda / 4 \). Then the phase difference between the waves from \( A \) and \( B \) reaching \( P \) is
(A) \( 156^{\circ} \)
(B) \( 136^{\circ} \)
(C) \( 140^{\circ} \)
(D) \( 126^{\circ} \)
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