Imagine you are standing on one side of a wall and there is a light source on the other side. which best describes why the light would become brighter as you approached the open door in the wall?
a) absorption
b) diffraction
c) reflection
d) refraction

The light would become brighter as you approached the open door behind the wall because of refraction. The wall blocks the light source that's why it's dimmer at a distance. When the person approaches the light source, the visible light becomes brighter as the distance decreases. 

The answer should be c.

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