A beam of plane polarized light is incident on 3 polarizers,the first with an axis at 30 $\degree$to the original plane of polarization,the second at 60 $\degree$ to the original plane of polarization,and the third at 90 $\degree$to the original plane of polarization.What angle does the plane of polarization of the transmitted light make with the original plane of polarization of the original beam?
A)30 $\degree$
B)90 $\degree$
C)180 $\degree$
D)The answer is not given.

Question

Quizplus · Accepted Answer

Each polarizer will block any component of the light that is perpendicular to its axis, so as the light passes through the three polarizers, only the component that is parallel to the axis of the third polarizer will be transmitted. Since the axis of the third polarizer is perpendicular to the original plane of polarization, the transmitted light will be polarized in the plane perpendicular to the original plane, which is 90° to the original plane. Therefore, the answer is (B) 90°.

A Beam of Plane Polarized Light Is Incident on 3 °\degree°

A Beam of Plane Polarized Light Is Incident on 3 $\degree$