How do you see the sun after it has set?

[soggybread]

How do you see the sun after it has set??

Homework Statement

The density of the atmosphere decreases with height, as does the index of refraction. Explain how one can see the sun after it has set.

Homework Equations

Snell's Law:

sin x1 * x1 = sin x2 * x2

The Attempt at a Solution

I'm not sure how to approach this at all, but i think it has something to do with Snell's law...

 

[Chi Meson]

Multiple choice time

What is the name of the phenomenon that allows us to actually see the light of the sun after the sun has moved (geometrically speaking) below the horizon:
a) reflection b) refraction c) diffraction d) interference e)scattering f) the flying spaghetti monster

hint: which does Snell's law have to do with, and where does the "n" come from?