Question

A beam of unpolarized light is passed first through a tourmaline crystal $A$ and then through another tourmaline crystal $B$ oriented so that its principal plane is parallel to that of $A$. The intensity of final emergent light is $I$. If $A$ is rotated by ${45}^0$ on a plane, perpendicular to the direction of incident ray, then intensity of emergent light will be

• A. $\frac{I}{8}$
• B. $\frac{I}{4}$
• C. $\frac{I}{2}$
• D. none of these

Answer 1

The correct option is C $\frac{I}{2}$

$I_I=Ico{s}^2\theta =Ico{s}^{2}45=\frac{I}{2}$
option $C$ is correct