Polarization of wave

x, y and z are three perpendicular directions. A polarised light wave is travelling in the z direction.

Which of the following describes the direction of the oscillations of the polarised light wave?

• They must be in the x direction.

• They must be in a plane which is perpendicular to the x direction.

• They must be in the z direction.

• They must be in a plane which is perpendicular to the z direction.

A filament lamp is a source of unpolarised light.

A polarising filter is placed between a filament lamp and an observer. The filter is rotated in the plane perpendicular to the direction of travel of the light.

Which of the following is observed as the filter is rotated through an angle of 90°?

• The light intensity changes from maximum to minimum.

• The light intensity changes from minimum to maximum.

• The light intensity does not change.

• The light intensity is zero throughout the rotation.

Which of the following describes the oscillations in polarised waves?

• in a single plane which is perpendicular to the direction of wave travel

• in many planes, which include the direction of wave trave

• in many directions and parallel to the direction of wave travel

• in one direction and perpendicular to the direction of wave travel

Which of the following statements about waves is correct?

• Both longitudinal and transverse waves can be polarised.

• Neither longitudinal nor transverse waves can be polarised.

• Only longitudinal waves can be polarised.

• Only transverse waves can be polarised.

A ray of unpolarised light is incident on a polarising filter. The polarising filter transmits light of intensity I, as shown.

The polarising filter is then rotated in the direction shown on the diagram.

Which of the following gives the intensity of light transmitted after the filter has been rotated 90°?

• 0

In plane polarised light, the oscillations of the electric field are

• in a single plane, which includes the direction of energy transfer.

• in a single plane, which is perpendicular to the direction of energy transfer.

• in perpendicular planes, which are perpendicular to the direction of energy transfer.

• in perpendicular planes, which include the direction of energy transfer.

Which of the following types of wave cannot be plane polarised?

• light

• microwaves

• ultrasound

• ultraviolet

Which of the following properties could not be demonstrated using sound waves?

• diffraction

• polarisation

• reflection

• refraction

Light from a lamp passes through two polarising filters, P1 and P2, before reaching a

detector. The filters initially have their planes of polarisation parallel.

The intensity of light at the detector will be greatest if

• P1 is rotated by 45° and P2 is rotated by 315° in the same direction.

• P1 is rotated by 90° and P2 is rotated by 270° in the same direction.

• P1 is rotated by 45° and P2 is rotated by 270° in the same direction.

• P1 is rotated by 90° and P2 is rotated by 315° in the same direction.

Which of the following phenomena provides evidence that light waves are transverse?

• diffraction

• interference

• polarisation

• refraction