Physics - Wave Optics Question with Solution | TestHub

If$\mathrm{l}$is the intensity of the incident unpolarized light, the intensity transmitted by the first is$\frac{\mathrm{l}}{2}.$This is the intensity of incident light on the second polaroid. Intensity transmitted by the second polaroid is$\left(\frac{\mathrm{l}}{2}\right){\cos }^2\mathrm{\theta },$where$\mathrm{\theta }$is the angle between the axes. Here$\sin \mathrm{\theta }=\frac{3}{5}$,$\cos \mathrm{\theta }$is therefore$\frac{4}{5}.$

$\frac{\mathrm{l}}{2}{\cos }^2\mathrm{\theta }=\frac{\mathrm{l}}{2}\times {\left(\frac{4}{5}\right)}^2=\frac{8}{25}\mathrm{l}$

$\frac{8}{25}$is the required ratio