Figure shows a set up to perform Young's double slit experiment. A ...

Figure shows a set up to
perform Young's double slit
experiment. A monochro-
matic source of light is
placed at \( S S_{1} \) and \( S_{2} \) and act
as coherent sources and
interference pattern is
obtained on the screen.
(1) i.-a., b.; ii.-c., d.; iii.-b., c.; iv.-b., d.
(2) i.-a.; ii.-c.; iii.-d.; iv.-b.
(3) i. \( - \) c.; ii. \( - \) a., b.; iii. \( - \) c., d.; iv. \( - \) a., b.
(4) i.-b., c.; ii. -a., b.; iii. \( - \) c.; iv. \( - \) a.