Reason ???

Started by dremzee
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dremzee

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Could anybody please tell me the reason why this happens ???
 
It selectively depolarizes the photoreceptors in your retina and then you see the "after image" when you look away from it (white depolarizes the most, so the after image creates a black color for the hair. The face has a blue tint which depolarizes the blue cones and you get a slight red tinge when you look away. Also you brain sees color and brightness by contrasting it to what's next to it; and the contrast also adds to the image.