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A parallel beam of monochromatic light falls normally on a 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 $W_c=2\left\lfloor\frac{\lambda D}{a}\right\rfloor$
$\Rightarrow \mathrm{W}_{\mathrm{e}} \propto \frac{1}{\mathrm{a}}$
$\therefore \quad$ Angular width of principal maximum decreases with increase in width of the slit.
$\Rightarrow \mathrm{W}_{\mathrm{e}} \propto \frac{1}{\mathrm{a}}$
$\therefore \quad$ Angular width of principal maximum decreases with increase in width of the slit.
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