Earth's atmosphere is able to gradually refract light rays:
A)because of the changing density of air as you get closer to the surface.
B)only when it is very dry.
C)only when the sun is very high in the sky.
D)because of air pollution that is present.

Question

Quizplus · Accepted Answer

The density of air changes as you move closer to the surface of the Earth, and this changing density allows for the gradual refraction of light rays. This is why objects can appear to be in slightly different positions in the sky than they actually are, especially near the horizon. Air pollution can affect the clarity of the atmosphere, but it does not play a direct role in the refraction of light. The presence of dry or humid air can affect the way that light interacts with the atmosphere, but it is not a requirement for refraction to occur. The angle of the sun in the sky can also affect the way that light is refracted, but it is not the only factor involved.

Earth's Atmosphere Is Able to Gradually Refract Light Rays