Polarizing Filter
Intensity after ideal polarizer on unpolarized light becomes:
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About This Question
- Subject
- physics
- Chapter
- electromagnetic waves
- Topic
- polarizing filter
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
I0/2
Unpolarized light consists of waves oscillating in all possible transverse directions.
- An ideal linear polarizer allows only the component of the electric field along its transmission axis.
- Mathematically, we average cos2θ over all angles from 0 to 2π, which is 1/2.
- Thus, the transmitted intensity is exactly half the incident intensity, regardless of the orientation of the polarizer.
This medium difficulty physics question is from the chapter electromagnetic waves, covering the topic of polarizing filter. It appeared in the 2025 exam.
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