A parallel beam of monochromatic light falls normally on single narrow slit. The angular width of the…
A parallel beam of monochromatic light falls normally on single narrow slit. The angular width of the central maximum in the resulting diffraction pattern
decrease with decrease of slit width
decreases with increase of slit width
increases with increase of slit width
may increase or decrease
Solution
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."