When most people stare at a red square and then shift their eyes to a white surface,the afterimage of the square is

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Quizplus · Accepted Answer

This phenomenon is due to the opponent-process theory of color vision, which suggests that colors are perceived through the opposition of color pairs: red-green, yellow-blue, and white-black. When you stare at a red square, you temporarily fatigue the receptors for red, and when you then look at a white surface (which contains all colors), the balance shifts towards green, the opposite color, creating a green afterimage.

When Most People Stare at a Red Square and Then