On which of the following factors angular fringe width does not depend?

distance between slits and screen

The correct answer is Option (4) → distance between slits and screen

Angular fringe width in Young's double-slit experiment is given by:

$\theta = \frac{\lambda}{d}$

where $\lambda$ is the wavelength of light and $d$ is the separation between the slits.

Thus, angular fringe width depends on $\lambda$ and $d$, i.e., on the ratio $\lambda/d$.

It does not depend on the distance between the slits and the screen.

Answer: distance between slits and screen