Electromagnetic Waves and Light Polarization

The video tutorial explains the concept of light polarization, starting with Maxwell's electromagnetic wave theory. It describes how light consists of electric and magnetic field vibrations, and differentiates between unpolarized and polarized light. The tutorial covers methods of polarization, including using Polaroids, reflection, and scattering. Key concepts such as Brewster's angle and Malus's law are discussed, providing a comprehensive understanding of how light can be polarized and the implications of these processes.

What is the main characteristic of an electromagnetic wave according to Maxvill's theory?

• It is composed of sound waves.

• It consists of electric and magnetic field vibrations.

• It only travels in a vacuum.

• It travels in a circular path.

What happens to light when it passes through a Polaroid?

• Light becomes unpolarized.

• Only vibrations parallel to the crystallographic axis pass through.

• Light intensity increases.

• All vibrations are blocked.

What is the plane of polarization?

• The plane parallel to the direction of light.

• The plane with maximum light intensity.

• The plane perpendicular to the plane of vibration.

• The plane containing all vibrations.

According to Malus's Law, how does the intensity of emergent light vary?

• It doubles with every 10-degree increase.

• It varies as the square of the cosine of the angle.

• It varies as the square of the sine of the angle.

• It remains constant regardless of angle.

What happens to the intensity of light when the analyzer is rotated by 90 degrees?

• The intensity remains the same.

• The intensity doubles.

• The intensity becomes zero.

• The intensity is halved.

What is the effect of passing plane polarized light through an analyzer with a parallel pass axis?

• The light is completely blocked.

• The light becomes unpolarized.

• The light intensity decreases.

• The light intensity remains unchanged.

What is Brewster's angle?

• The angle at which light intensity is maximum.

• The angle at which light is completely absorbed.

• The angle at which light is completely refracted.

• The angle at which reflected light is completely polarized.

How is the refractive index related to Brewster's angle?

• It is equal to the sine of Brewster's angle.

• It is unrelated to Brewster's angle.

• It is equal to the cosine of Brewster's angle.

• It is equal to the tangent of Brewster's angle.

What is the primary result of Rayleigh scattering?

• Light intensity decreases uniformly.

• Light is scattered in all directions equally.

• Light is absorbed by air molecules.

• Light is polarized perpendicular to the direction of the ray.

In which direction is the light completely plane polarized due to scattering?

• In all directions equally.

• Parallel to the original ray.

• In the direction of the original ray.

• Perpendicular to the original ray.