On which of the following factors angular fringe width does not depend?
Answer & explanation
Correct answer: option 4
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