Question

Why is red the last color seen at sunset?

a:It reflects off the atmosphere.
b:It is scattered the least by the air.
c:It is bent the most by the air.
d:It is bent by raindrops.

Answer 1

Within the visible range of light, red light waves are scattered the least by atmospheric gas molecules. So at sunrise and sunset, when the sunlight travels a long path through the atmosphere to reach our eyes, the blue light has been mostly removed, leaving mostly red and yellow light remaining.