Answer & explanation
Correct answer: option 4
$\text{Fringe Width}\beta = \frac{\lambda D}{d}$
$ \Rightarrow \beta \propto \frac{D}{d}$
$\text{ if distance between slit is made 1/2 times and D is doubled then fringe width will be quadrupled}$
Correct answer: option 4
$\text{Fringe Width}\beta = \frac{\lambda D}{d}$
$ \Rightarrow \beta \propto \frac{D}{d}$
$\text{ if distance between slit is made 1/2 times and D is doubled then fringe width will be quadrupled}$