Two coherent light sources \( A \) and \( B \) are at a distance \( 3 \lambda \) from each other...

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Two coherent light sources \( A \) and \( B \) are at a distance \( 3 \lambda \) from each other ( \( \lambda= \) wavelength). The distance from \( A \) on the \( x \)-axis at which the interference is constructive is

(a) \( 3 \lambda \)
(b) \( 4 \lambda \)
(c) \( 3.5 \lambda \)
(d) \( 1.5 \lambda \)
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