Question

In a single slit diffraction experiment, the width of the slit is made half the original width

• A. the width of the central maxima becomes double
• B. the width of the central maxima becomes half
• C. the width of the central maxima becomes one fourth
• D. the width of the central maxima becomes four times.

Answer 1

Answer: (A)

the width of the central maxima becomes double

We have $w\propto \frac{1}{d}$, where $d$ is the width of the slit.
If $d^{\prime }=\frac{d}{2}$ then $w^{\prime }\propto 2w$