Question

why does the sun appear even after the sunset ?? (class 10th chapter human eye)​

Answer 1

Answer:

Did you know that you can actually see the Sun a few minutes before it rises and a few minutes after it sets? This is because of refraction.

Explanation:

timeanddate.com;

What Is Refraction of Light?

By Konstantin Bikos and Aparna Kher

Did you know that you can actually see the Sun a few minutes before it rises and a few minutes after it sets? This is because of refraction.

Atmospheric refraction occurs due to light rays being bent by Earth's atmosphere.

The mechanics of refraction.

Magic Atmosphere

One of mother nature's favorite magic tricks, refraction is the bending of light as it moves from one substance to another. It is responsible for a variety of optical phenomena including rainbows, mirages, halos, and sundogs. It is also the reason why stars twinkle at night, your diamond ring sparkles, a straw or pencil in water looks bent, and the Sun can be seen even when it is below the horizon.

How much a light wave bends depends on its wavelength, the density of the substance it is moving into, and the angle at which it hits the edge of the substance. When light moves from a less dense to a more dense substance, like air to water or from a less dense layer of the atmosphere to a denser layer, it bends towards the normal—an imaginary line that is perpendicular to the surface of both media. The opposite occurs when light moves from a more dense to a less dense substance. The angle between the normal and the refracted light ray is known as the angle of refraction.

If light enters a medium from another substance at a 90-degree angle, it does not refract and passes right through.

The density of Earth's atmosphere is uneven—it decreases with increasing altitude. Light from celestial objects, including the Sun, therefore refracts multiple times when it enters the atmosphere from space.

Answer 2

Answer:

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ᴀᴛᴍᴏsᴘʜᴇʀɪᴄ ʀᴇғʀᴀᴄᴛɪᴏɴ ᴍᴀᴋᴇs ᴛʜᴇ sᴜɴ ᴠɪsɪʙʟᴇ ᴇᴠᴇɴ ᴡʜᴇɴ ɪᴛ ɪs ᴊᴜsᴛ ʙᴇʟᴏᴡ ᴛʜᴇ ʜᴏʀɪᴢᴏɴ.ʏʜɪs ᴇғғᴇᴄᴛ ɪs ᴇsᴘɪᴄᴀʟʟʏ ᴘᴏᴡᴇʀғᴜʟ ғᴏʀ ᴏʙᴊᴇᴄᴛ ᴛʜᴀᴛ ᴀᴘᴘᴇᴀʀ ᴄʟᴏsᴇ ᴛᴏ ᴛʜᴇ ʜᴏʀɪᴢᴏɴ sᴜᴄʜ ᴀs ʀɪsɪɴɢ ᴏʀ sᴇᴛᴛɪɴɢ ᴛʜᴇ sᴜɴ...

Explanation:

ʜᴏᴘᴇ ɪᴛs ʜᴇʟᴘғᴜʟ..