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Q.

The apparent flattening of the Sun’s disc at sunrise and sunset is also due to ____ refraction.


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Detailed Solution

The apparent flattening of the Sun's disc at sunrise and sunset is also due to atmospheric refraction.
The medium becomes less dense as one ascends, which causes the rays coming from above and below to be refracted at various angles. At dawn and sunset, the Sun seems to flatten due to this. However, sunlight's sideways beams are often refracted by the same amount. The Sun still seems spherical from all angles. The Sun is visible to us 2 minutes earlier than the actual sunrise and 2 minutes after the actual sunset.
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