Question

The plane of polarisation is:
(This question has multiple answers)
A) The plane in which vibrations of electric vectors takes place.
B) A plane perpendicular to the plane in which the vibrations of the electric vector takes place.
C) Perpendicular to the plane of vibration
D) Horizontal plane

Answer 1

Hint: The polarisation principle arises when we want to enter only the electromagnetic - waves of our wish. The polarisation means allowing light rays based on its geometric orientation. There are two orientations called horizontal and vertical. The process of polarization is done by polarisers. And the plane of polarisation is the direction of light rays the polariser allows or the direction of polarization.

Complete step by step answer:
(i) The plane of polarisation is the direction of polarisation.
(ii) The plane of vibration is the plane in which the vibration of the electric vector takes place.
(iii) Hence we can that the plane of vibration is perpendicular to the plane of polarisation.

Hence the correct options among the given options are B and C.

Additional information:

(i) The term polarisation means allowing the electromagnetic waves of a particular orientation to either be horizontal or vertical.
(ii) The plane which allows the electromagnetic waves is called a polariser. And the plane perpendicular to the polarizer is called an analyzer.
(iii) The plane of polarisation is the direction of propagation of the polarized light. And it is perpendicular to the plane of vibration.
(iv) This phenomenon was first identified by Malus in 1908. And he provided a law called “Malus law" He states that When light is polarised by the polariser, its irradiance,
$I = {I_0}{\cos ^2}\theta $,
Where ${I_0}$ is the intensity of the light and
$\theta $ is the angle between the light’s orientation before polarisation and the axis of the polariser.
(v) Polarisation is a principle that is applied in photography to avoid the unwanted light, in the Liquid Crystal Display, in radio transmission, etc.

Note:
The plane of polarization is the direction of the propagation of the polarised light. And the plane of polarization is perpendicular to the plane in which the electric field vectors vibrate. Hence the direction of the polarised light is perpendicular to the un-polarised light. The polarisation is done by the polariser. Polarisation is the basic principle used in screens like LCD’s etc.