In a single slit different experiment , the width of the slit is made double its original width . Then the central maximum of the diffraction pattern will become :
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The angular width of the central maximum is 
where a is the width of the slit. If the value of a is doubled the angular width of the central maximum decrease to half its earlier value this implies that the central maximum becomes much sharper. Furthermore if a sis doubled the intensity of the central maximum becomes four times thus the central maximum becomes four times thus the central maximum becomes much sharper and brighter.
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