Physics - Wave Optics Question with Solution | TestHub

The direction in which the first minima occurs is$\theta$(say).

Then$\mathrm{esin\theta }=\mathrm{\lambda }$or$\mathrm{e\theta }=\mathrm{\lambda }$

$\mathrm{\theta }=\frac{\mathrm{\lambda }}{\mathrm{e}} \because \mathrm{sin\theta }=\mathrm{\theta }$when$\mathrm{\theta }$is small



Width of the central maximum$=2\mathrm{b\theta }+\mathrm{e}=2\mathrm{b}\frac{\mathrm{\lambda }}{\mathrm{e}}+\mathrm{e}$