alleryThe twinkling of stars is due to:
AAtmospheric refraction in air layers of varying density
BLight pollution
CInternal reflection in the eye (option)
DRotation of the Earth
Answer & Solution
Correct answer: A. Atmospheric refraction in air layers of varying density
1. Starlight crosses air layers of differing temperature and density.
2. Each layer has a slightly different refractive index, refracting the ray.
3. The continually fluctuating refraction makes the star's brightness flicker — twinkling.
_Source: syllabus Science, Ch 10 "The Human Eye and the Colourful World", §10.5_
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