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What is the effect of rotating a polarizer in front of a polarized light source?

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Question: What is the effect of rotating a polarizer in front of a polarized light source?

Options:

  1. Intensity remains constant
  2. Intensity increases
  3. Intensity decreases
  4. Intensity first increases then decreases

Correct Answer: Intensity first increases then decreases

Solution: 

As the polarizer is rotated, the intensity of the transmitted light varies according to the cosine square of the angle between the light\'s polarization direction and the polarizer\'s axis.

What is the effect of rotating a polarizer in front of a polarized light source?

Practice Questions

Q1
What is the effect of rotating a polarizer in front of a polarized light source?
  1. Intensity remains constant
  2. Intensity increases
  3. Intensity decreases
  4. Intensity first increases then decreases

Questions & Step-by-Step Solutions

What is the effect of rotating a polarizer in front of a polarized light source?
  • Step 1: Understand that polarized light has a specific direction of vibration. This means the light waves are aligned in one direction.
  • Step 2: A polarizer is a special filter that only allows light waves aligned with its axis to pass through.
  • Step 3: When you place a polarizer in front of a polarized light source, the light can pass through the polarizer if its direction matches the polarizer's axis.
  • Step 4: As you rotate the polarizer, the angle between the light's polarization direction and the polarizer's axis changes.
  • Step 5: The intensity of the light that comes out of the polarizer depends on this angle. Specifically, it follows a mathematical rule called 'cosine square'.
  • Step 6: When the angle is 0 degrees (aligned), the light is at its brightest. As you rotate to 90 degrees (perpendicular), the light intensity drops to zero.
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