The relation $I=I_0 \cos ^2 \theta$ is $\left(\mathrm{I}_0\right.$ - Intensity of incident light on the…
The relation $I=I_0 \cos ^2 \theta$ is $\left(\mathrm{I}_0\right.$ - Intensity of incident light on the analyser, I intensity of emergent light from the analyser, $\theta$ - angle between plane of polarization and the axis of analyser)
Newton's law
Snell's law
Brewster's law
Malus's law
Solution
The relation $I=I_0 \cos ^2 \theta$ is given by Molus's law.