3.6 Polarisation

• Match the type of wave with its oscillation direction:

  Transverse Waves ↔️ Perpendicular to energy transfer

  Longitudinal Waves ↔️ Parallel to energy transfer
• Selective reflection by water can produce polarized light.


  True
• What is an example of polarized light from everyday life?

  Light from LCD screens
• In which direction do the oscillations occur in transverse waves?

  Vertical
• Match the type of light with its oscillation properties:

  Unpolarized Light ↔️ Vibrates in all planes

  Polarized Light ↔️ Vibrates in a single plane
• Elliptical polarization occurs when wave oscillations vibrate in an elliptical plane.


  True
• Dichroism uses dichroic materials that selectively absorb light vibrating in one plane.
• Linear polarization involves waves vibrating in a single plane
• Dichroism uses dichroic materials that selectively absorb light vibrating in one plane
• What is the defining characteristic of transverse waves?

  Perpendicular oscillations
• What is the process of polarization?

  Restricting wave oscillations
• What is the oscillation pattern in linear polarization?

  A single plane
• Match the polarization method with its physical process:

  Dichroism ↔️ Selective absorption

  Scattering ↔️ Interaction with particles

  Reflection ↔️ Brewster angle
• Polarimeters are used to determine the concentration of chemicals in solutions
• Polarization is a property of transverse waves like light.


  True
• Malus' Law describes how the intensity of light changes after passing through a polarizer.


  True
• In transverse waves, the oscillations are perpendicular to the direction of energy transfer.

  True
• Longitudinal waves have oscillations parallel to the direction of energy transfer.


  True
• Polarization is the restriction of wave oscillations to a single plane.
• Steps in the mechanism of polarization:

  1️⃣ Selective absorption of light in one plane

  2️⃣ Selective reflection of light at a surface
• Arrange the types of polarization based on their oscillation pattern complexity:

  1️⃣ Linear

  2️⃣ Circular

  3️⃣ Elliptical
• Transverse waves are waves where the oscillations are perpendicular to the direction of energy transfer.
• Polarization is the restriction of wave oscillations to a single plane.
• In polarized light, wave oscillations vibrate in a single plane.
• In transverse waves, the oscillations are perpendicular to the direction of energy transfer.
• Polarization is the restriction of wave oscillations to a single plane.
• What is the oscillation pattern in linear polarization?

  Straight line
• Match the type of polarization with its oscillation pattern:

  Linear ↔️ Vibrates in a single plane

  Circular ↔️ Vibrates in a circular plane

  Elliptical ↔️ Vibrates in an elliptical plane
• Reflection at the Brewster angle results in polarized light.


  True
• What type of wave oscillation is characteristic of circular polarization?

  A circular plane
• What type of scattering polarizes light as it interacts with air molecules?

  Raleigh scattering
• Selective reflection, such as from water, can result in polarized light
• In circular polarization, the wave oscillates in a circular plane
• Polarized sunglasses reduce glare by using dichroic materials to absorb light vibrating in one plane.

  True
• Polarization is a fundamental property of transverse waves like light, enabling various applications in sunglasses and polarimeters.


  True
• What type of material is used in polarized sunglasses to reduce glare?

  Dichroic
• What is the formula for Malus' Law?

  I = I_0 \cos^2 \theta</latex>
• What is an example of a transverse wave?

  Light wave
• What is an example of a longitudinal wave?

  Sound wave
• What is an example of a surface that can polarize light through reflection?

  Water