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Light from a star changes colour during twinkling because:
AThe star itself oscillates colour
BPolarisation rotates the colour spectrum
CAtmospheric ozone absorbs colours selectively
DDifferent colours refract differently in changing air
Answer & Solution
Correct answer: D. Different colours refract differently in changing air
1. The atmosphere disperses starlight slightly (different colours bend by different amounts).
2. Rapidly changing air layers shift the apparent direction of each colour differently.
3. Observer's eye sees brief flashes of different colours — twinkling with chromatic flicker.
_Source: NCERT Class 10 Science Ch 10 §10.4 (atmospheric refraction)_
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