c
(c)Fringe width \(\beta\) \(\propto\) \(\lambda\). Therefore, \(\lambda\) and hence \(\beta\) decreases \(1.5\) times when immersed in liquid. The distance between central maxima and \(10^{th}\) maxima is \(3 \,cm\) in vacuum. When immersed in liquid it will reduce to \(2\, cm\). Position of central maxima will not change while \(10^{th}\) maxima will be obtained at \(y = 4\,cm.\)