In the set up shown in Fig, the two slits \( S_{1} \) and \( S_{2} \) are not equidistant from t...

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In the set up shown in Fig, the two slits \( S_{1} \) and \( S_{2} \) are not equidistant from the slit \( S \). The central fringe at \( O \) is then
(A) Always bright
(B) Always dark
(C) Either dark or bright depending on the position of \( S \)
(D) Neither dark nor bright.
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