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The apparent flattening of the Sun's disc at sunset is due to:
Answer & Solution
Correct answer: B.
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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