Phase difference between two coherent light waves having same amplitude \( A \) is \( 2 \pi / 3 ...

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Phase difference between two coherent light waves having same amplitude \( A \) is \( 2 \pi / 3 \). If these waves superpose each other at a point, then resultant amplitude at the point of superposition will be
(a) \( 2 A \)
(b) 0
(c) \( A \)
(d) \( A^{2} \)
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