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The apparent flattening of the Sun's disc at sunset is due to:
ARotation of the Earth
BAtmospheric refraction varying with the altitude of the Sun above the horizon
CSolar storms
DDispersion of sunlight (option)
Answer & Solution
Correct answer: B. Atmospheric refraction varying with the altitude of the Sun above the horizon
1. Refraction near the horizon is greater than higher up due to denser, cooler air.
2. The bottom edge of the Sun is lifted optically more than the top edge.
3. This unequal lifting flattens the apparent disc.
_Source: NCERT Class 10 Science, Ch 10 "The Human Eye and the Colourful World", §10.5_
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