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Polarization Filters quiz

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  • What is the polarization of an electromagnetic wave?
    It is the angle of the electric field relative to a defined origin, usually measured from a zero-degree reference.
  • How is unpolarized light represented in terms of electric field orientations?
    Unpolarized light consists of electric fields at all possible polarization angles, covering 360 degrees.
  • What does a polarization filter do to incoming light?
    A polarization filter only allows light with a specific polarization angle to pass through, blocking all other angles.
  • What happens to the intensity of unpolarized light after passing through a polarization filter?
    The intensity always drops by half, regardless of the filter's angle.
  • What variable is commonly used to represent the intensity of light entering a polarization filter?
    The variable I₀ (I naught) is used for the intensity of light entering the filter, regardless of its polarization state.
  • What is the equation for the intensity of polarized light after passing through a polarization filter?
    The intensity I = I₀ × cos²(φ), where φ is the polarization difference between the light and the filter.
  • How do you calculate the polarization difference (φ) for two angles?
    The polarization difference is the absolute value of the difference between the initial polarization angle and the filter's angle.
  • What happens to light intensity if the polarization difference is 90 degrees?
    No light passes through; the intensity drops to zero.
  • If unpolarized light of 100 W/m² passes through a polarization filter, what is the intensity after the filter?
    The intensity is 50 W/m², which is half the original intensity.
  • After passing through a first filter at 45° and a second at 55°, what is the polarization difference for the second filter?
    The polarization difference is 10°, calculated as 55° - 45°.
  • What is the intensity after the second filter if the first filter's output is 50 W/m² and the polarization difference is 10°?
    The intensity is 50 × cos²(10°) = 48.5 W/m².
  • Does the angle of the polarization filter matter for the intensity drop of unpolarized light?
    No, the intensity always drops by half for unpolarized light, regardless of the filter's angle.
  • What does it mean for light to be polarized at 0 degrees?
    It means the electric field oscillates in a direction aligned with the reference (origin) angle.
  • What is the effect of a polarization filter on already polarized light?
    The intensity is reduced according to the cosine squared of the polarization difference between the light and the filter.
  • Why is it important to understand the notation I₀ in polarization problems?
    Because I₀ always refers to the intensity entering a filter, not necessarily unpolarized light, and is used consistently in equations.