Answer & explanation
Correct answer: option 1
$\text{Fringe Width}\beta = \frac{\lambda D}{d}$
$ \Rightarrow \beta \propto \frac{1}{d}$
$\text{ if slit width is made 3 times then fringe width will be one third of initial value}$
Correct answer: option 1
$\text{Fringe Width}\beta = \frac{\lambda D}{d}$
$ \Rightarrow \beta \propto \frac{1}{d}$
$\text{ if slit width is made 3 times then fringe width will be one third of initial value}$