Blue sky seen through a rotating polaroid rises and falls in brightness. Sky light is:
AFully unpolarised
BPurely monochromatic
CMostly infrared
DPartly polarised
Answer & Solution
Correct answer: D. Partly polarised
1. Sunlight is scattered by air molecules.
2. Scattering polarises the light.
3. So the sky light is partly polarised.
_Source: NCERT Class 12 Physics Part II, Chapter 10, Wave Optics._
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