Question

. Assertion: The Sun’s disc appears to be flattened at Sunrise and Sunset.

Reason: The Sun is near the horizon at Sunrise and Sunset and Sunlight suffers

atmospheric refraction.​

Answer 1

Answer:

(a) Both (A) and (R) are true and (R) is correct explanation of the (A).

Explanation:

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Answer 2

Both assertion and reason are true and reason is correct explanation for assertion.

Explanation:

• Earth's atmosphere has different layers and all layers have different temperature. This is a reason why density of atmosphere is variable. It is not constant throughout the medium.
• The portion or layer of atmosphere that is cool has higher refractive index than any comparatively warm layer.
• This difference in refractive index causes atmospheric refraction.
• Sunlight passes through the atmosphere which has multiple layers of different refractive index and refraction takes place.
• Atmosphere is denser closer to the surface of Earth than it is higher up.
• Apparent flattening of sun's disk at sunrise or sunset is also a cause of atmospheric refraction.