Polarization

The video tutorial explains the concept of polarized waves using a rope activity, demonstrating how wave motion can be represented mathematically. It covers filtering polarized waves with fences, using Polaroid sheets to show light intensity changes, and explains polarization by reflection and scattering. Brewster's law is discussed, highlighting its applications in determining refractive indices and reducing glare with polarized sunglasses.

What is the mathematical representation of a wave motion described in the video?

• y(x, t) = a tan(kx - omega t)

• y(x, t) = a cos(kx + omega t)

• y(x, t) = a sin(kx - omega t)

• y(x, t) = a sin(kx + omega t)

How does a vertical wooden fence affect a wave in the horizontal plane?

• It allows the wave to pass through.

• It amplifies the wave.

• It blocks the wave.

• It reflects the wave.

What happens to the intensity of light when a second Polaroid sheet is rotated by 90 degrees?

• The intensity doubles.

• The intensity increases.

• The intensity remains the same.

• The intensity decreases to zero.

According to Malus's Law, how does the intensity of light vary with the angle between two polarizers?

• I = I0 tan^2(theta)

• I = I0 cos(theta)

• I = I0 cos^2(theta)

• I = I0 sin^2(theta)

What did Brewster discover about the polarization of light by reflection?

• Light is polarized perpendicular to the surface.

• The sine of the polarization angle equals the refractive index.

• Light is polarized parallel to the surface.

• The tangent of the polarization angle equals the refractive index.

How do polarized sunglasses reduce glare?

• By reflecting light.

• By absorbing light.

• By using Brewster's angle to block horizontal light.

• By increasing the intensity of light.

What causes light to be scattered in a medium?

• Absorption by atoms

• Vibration of electrons

• Refraction through a medium

• Reflection from surfaces