Also intensity \(\propto(\text { Amplitude })^{2} \propto\) (Slit width \()^{2}\)
\(\frac{{I}_{1}}{{I}_{2}}=\left(\frac{3}{1}\right)^{2}=9 \Rightarrow {I}_{1}=9 {I}_{2}\)
\(\frac{{I}_{\min }}{{I}_{\max }}=\left(\frac{\sqrt{{I}_{1}}-\sqrt{{I}_{2}}}{\sqrt{{I}_{1}}+\sqrt{{I}_{2}}}\right)^{2}=\left(\frac{3-1}{3+1}\right)^{2}=\frac{1}{4}=\frac{{x}}{4}\)
\(\Rightarrow {x}=1.00\)