Question

The sun is visible a little before it rises on the horizon and a little after it sets below the horizon. This is a consequence of the phenomenon of

Answer 1

Answer:

The sun would be visible even after setting or even before rising due to the refraction of the light rays which take place in the atmosphere  .

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Answer 2

$\large\boxed{\fcolorbox{blue}{yellow} {Answer}}$

The sun is visible a little before it rises on the horizon and a little after it sets below the horizon. This is a consequence of the phenomenon of

refraction of light.

$\large\boxed{\fcolorbox{blue}{yellow}{Explanation }}$

1. The earth is surrounded by an atmosphere which is denser near the surface of the earth.

2. When the rays of light from the Sun enter the earth's atmosphere from outer space, they travel from a rarer medium to a denser medium.

3. Hence, they bend towards the normal on refraction.

4. Hence, even when th sun is below the horizon while rising or setting, its rays reach is due to refraction and it appears to be on the horizon.

Therefore, the sun is seen on the horizon a little before sunrise as well as for some time even after sunset.

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