Question:
Which of the following rays can be polarised?
Which of the following rays can be polarised?
Updated On: May 19, 2022
- Water wave and sound wave
- Sound wave and radio wave
- X-rays and water wave
- Light wave and X-ray
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The Correct Option is D
Solution and Explanation
Only transverse waves can be polarised. Light waves and X-rays are transverse, hence the vibrations of the electric vector must occur in a plane perpendicular to the direction of propagation of light and hence, give rise to polarised light. Note: Longitudinal waves cannot be polarised.
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Concepts Used:
Polarisation
Light travels in form of transverse EM waves. The underlying oscillation is along directions perpendicular to the propagation direction, in this example, oscillating electric and magnetic fields. Process of restricting the vibration of light waves to one direction is known as Polarisation.
Types of Polarisation:
There are three types of polarisation such as:
- Linear Polarisation in the electric field of light is limited to one single plane that is along the direction of propagation.
- Elliptical Polarisation: In this, both the phase difference and amplitude between the two linear components are not equal.
- Circular Polarisation: The electric field of light follows a circular propagation. The two linear components that exist in the electric field are the same amplitudes but have different phase differences.
Methods of Polarisation of Light:
The few methods of polarisation of Light are:
- Polarization by dispersing
- Polarization by Reflection
- Polarization by Refraction
- Polarization By Transfer