$P_1$ and $P_2$are two polaroids
The intensity of the unpolarised is Io and intensity of the transmitted height is $\frac{3I_0}{8}$. The angle between axis of $P_1$ and $P_2$ is:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 30°
According to Malus' Law,
$I=I_0\cos^2θ$
$⇒\frac{3I_0}{8}=I_0\cos^2θ$
$⇒\cos^2θ=\frac{3}{4}$
$⇒\cos θ=\sqrt{\frac{3}{4}}$
$∴θ=\cos^{-1}\frac{\sqrt{3}}{2}=30°$