Ordinary lamp light passes through one polaroid. Its intensity drops to:
AAbout double
BAbout half
CExactly zero
DAbout a quarter
Answer & Solution
Correct answer: B. About half
1. Unpolarised light has all vibration directions.
2. The polaroid keeps only one direction.
3. The intensity falls to about half.
_Source: NCERT Class 12 Physics Part II, Chapter 10, Wave Optics._
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