Ratio of intensities between a point \( A \) and that of central fr...

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Ratio of intensities between a point \( A \) and that of central fringe is \( 0.853 \). Then path difference between two waves at point \( A \) will be
(a) \( \frac{\lambda}{2} \)
(b) \( \frac{\lambda}{4} \)
(c) \( \frac{\lambda}{8} \)
(d) \( \lambda \)
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