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If two polarizers are placed in series with their axes at 90 degrees to each oth

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Question: If two polarizers are placed in series with their axes at 90 degrees to each other, what will be the intensity of light passing through?

Options:

  1. It will be maximum
  2. It will be minimum
  3. It will be half of the original intensity
  4. It will be one-fourth of the original intensity

Correct Answer: It will be minimum

Solution: 

When two polarizers are at 90 degrees to each other, no light passes through, resulting in minimum intensity.

If two polarizers are placed in series with their axes at 90 degrees to each oth

Practice Questions

Q1
If two polarizers are placed in series with their axes at 90 degrees to each other, what will be the intensity of light passing through?
  1. It will be maximum
  2. It will be minimum
  3. It will be half of the original intensity
  4. It will be one-fourth of the original intensity

Questions & Step-by-Step Solutions

If two polarizers are placed in series with their axes at 90 degrees to each other, what will be the intensity of light passing through?
  • Step 1: Understand what a polarizer does. A polarizer only allows light waves that are aligned with its axis to pass through.
  • Step 2: When light passes through the first polarizer, it becomes polarized in the direction of that polarizer's axis.
  • Step 3: The second polarizer is placed at 90 degrees to the first one. This means its axis is perpendicular to the light coming from the first polarizer.
  • Step 4: Since the light from the first polarizer is polarized in one direction, and the second polarizer is at 90 degrees, the second polarizer will block all of the light.
  • Step 5: Therefore, no light passes through the second polarizer, resulting in zero intensity of light after both polarizers.
  • Polarization of Light – Understanding how polarizers work and how the orientation of their axes affects light intensity.
  • Malus's Law – The principle that describes the intensity of light passing through a polarizer based on the angle between the light's polarization direction and the polarizer's axis.
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