\(\Rightarrow\) Intensity of light transmitted from \(P_{1}=\frac{I_{0}}{2}\).
Pass axis of \(\mathrm{P}_{2}\) will be at an angle of \(30^{\circ}\) with \(\mathrm{P}_{1}\)
\(\therefore\) Intensity of light transmitted from
\(P_{2}=\frac{I_{0}}{2} \cos ^{2} 30^{\circ}=\frac{3I_{0}}{8}\)
Pass axis of \(\mathrm{P}_{3}\) is at an angle of \(60^{\circ}\) with \(\mathrm{P}_{2}\)
\(\therefore \) Intensity of light transmitted from
\({P_3} = \frac{{3{I_0}}}{8}{\cos ^2}{60^\circ } = \frac{{3{I_0}}}{{32}}\)
\(\therefore\left(\frac{I_{0}}{I}\right)=\frac{32}{3}=10.67\)