Our perception of the brightness of a colour is affected mainly by the amplitude of light waves.
What is the perception of the brightness?
Rods are mostly responsible for night and peripheral vision, while cones are primarily responsible for daytime and acute vision. Variations in the pupil's size control how much light enters the eye. A red, green, and blue light projected into space will appear as white light at the intersection of the three colours.
For the past thirty minutes, Eric has been donning a pair of red welding goggles. Eric should anticipate that items will momentarily seem green when he removes the red goggles, in accordance with the opponent-process theory of colour vision. This phenomena is brought on by the vast amount of light pollution in the universe. Stars don't actually twinkle, despite what you would think.
Thus, it is the amplitude of light waves.
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