Physics - Wave Optics Question with Solution | TestHub

The intensity$I$of the transmitted light varies directly as the square of the cosine of the angle between the transmission direction of polariser and the analyser.

$I=I_0{\cos }^2\theta$

Intensity of finally transmitted light after passing through the polaroid B is given by$I=I_0{\cos }^2\theta$(Intensity)

$I=I_0\cdot {\cos }^2{30}^o$

$I=0.75I_0$

where,$I_0$is the maximum intensity of transmitted light.