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A parallel beam of monochromatic light falls normally on single narrow slit. The angular width of the central maximum in the resulting diffraction pattern
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decreases with increase of slit width
Width of central maximum, $\beta=\frac{2 \lambda D}{d} \propto \frac{1}{d}$, where $d$ is width of the slit. "The angular width of central maximum decreases with increase of slit width."
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