In Young's double slit experiment, if the slit widths are in the ratio 1 : 9, then the ratio of the intensity at minima to that at maxima will be

Slit width ratio =1:9 Since slit width ratio is the ratio of intensity and intensity ∝ (amplitude)2  ∴I1:I2=1:9 ⇒a12:a22=1:9⇒a1:a2=1:3 Imax=a1+a22,Imin=a1−a22⇒IminImax=14