Which of the following statements are true about the diffraction pa...

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Which of the following statements are true about the diffraction pattern?
I. It has a central bright maxima of twice the width of other maxima.
II. The first null occurs at an angle \( \lambda / 2 a \).
III. The intensity of maxima falls as we move away from the central maxima.
IV. The bands are of decreasing width.
(a) II and III
(b) I and II
(c) I, III and IV
(d) I and III
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