Physics - Wave Optics Question with Solution | TestHub

In figure, unpolarized light is sent into a system of three polarizing sheets. The angles ${\theta }_1,{\theta }_2$ and ${\theta }_3$ of the polarizing directions are measured counterclockwise from the positive direction of the y axis. Angles ${\theta }_1$ and ${\theta }_3$ are fixed, but angle ${\theta }_2$ can be varied. Figure gives the intensity of the light emerging from sheet 3 as a function of ${\theta }_2$. What percentage of the light's initial intensity (approximately) is transmitted by the three-sheet system when ${\theta }_2=90^{\circ }$ ? Take : $\sin 50^{\circ }=0.75$.