Class 12 Physics Wave Optics Polarizing and unpolarized light wave

Polarizing and unpolarized light wave

  • Polarized wave: - Polarized wave is defined as the vibration of the wave confined to specific plane.

 

  1. In case of polarized wave the vibrations takes place in one plane not in multiple planes and it is perpendicular to the direction of propagation.
  2. For example: -
    1. Vibrations of a rubber. It will vibrate randomly in all different directions. But when it is passed through a small slit then it will vibrate only in one plane.

 

  • Unpolarized wave:-Unpolarized wave is defined as the plane of vibration which changes randomly in short intervals of time.
    • In case of unpolarized wave the vibrations takes place in multiple planes and it is perpendicular to the direction of propagation.

 

What is polarization?

Polarization is the process of transforming unpolarized light into polarized light.

Methods of polarization:-

  1. Polarization by Polaroid’s
  2. Polarization by Scattering
  3. Polarization by Reflection
  4. Polarization by Refraction

For example: - 3-D movies, sun glasses, photographic cameras.

Polarization: Transverse vs. Longitudinal waves

  • In case of transverse waves there are many different ways in which particles can oscillate.
  • Polarization is observed in transverse waves.
  • In case of longitudinal waves there is only one direction in which particles oscillate.
  • Therefore there is no polarized or unpolarized light in case of longitudinal wave.

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