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A parallel beam of light \( (\lambda=5000 \AA) \) is incident at an angle \( \alpha=30^{\circ} \) with the normal to the slit plane in a Young's double-slit experiment. Assume that the intensity due to each slit at any point on the screen is \( I_{0} \). Point \( O \) is equidistant from \( S_{1} \) and \( S_{2} \) (see the following figure). The distance between slits is \( 1 \mathrm{~mm} \)
(A) The intensity at \( O \) is \( 4 I_{0} \)
(B) The intensity at \( O \) is zero
(C) The intensity at a point on the screen \( 1 \mathrm{~m} \) below \( O \) is \( 4 I_{0} \)
(D) The intensity at a point on the screen \( 1 \mathrm{~m} \) below \( O \) is zero
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