Question

A Plane polarized light is incidents on an analyzer. The intensity then becomes three-fourth. The angle of the axis of the analyzer with the beam is

• A. ${30}^0$
• B. ${45}^0$
• C. ${60}^0$
• D. zero

Answer 1

Answer: (A)

${30}^0$

Intensity of light after passing through an analyzer which is at an angle $\theta$ with the beam,

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

$⟹\frac{3}{4}{I}_0=I_0{\cos }^2\theta$

$\cos \theta =\frac{\sqrt{3}}{2}$

$⟹\theta ={30}^{\circ }$