The slits in a Young's double slit experiment have equal widths and the source is placed symmetr...

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The slits in a Young's double slit experiment have equal widths and the source is placed symmetrically relative to the slits. The intensity at the central fringes is \( I_{0} \). If one of the slits is closed, the intensity at this point will be
(A) \( I_{0} \)
(B) \( I_{0} / 2 \)
(C) \( I_{0} / 4 \)
(D) \( 4 I_{0} \)
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