Question

Angular width $\left(\theta \right)$ of the central maximum, in a diffraction pattern of a single slit does not depend upon,

• A. distance between slit and source
• B. wavelength of light used
• C. width of the slit
• D. All of the above

Answer 1

The correct option is A distance between slit and source

In a single slit diffraction pattern, the angular width of central maximum is, $y=2\beta =\frac{2\lambda }{a}$
Where, $\lambda$ - Wavelength of light used $(\lambda =\frac{c}{f})$
$f\to$ frequency of light used
$a\to$ Width of the slit

From the above equations, it is clear that the angular width is independent of distance between slit and
source.

Hence, $\left(A\right)$ is the correct answer.