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Boojho while waving his hand very fast in front of his eyes, observes that his fingers appear blurred. What could be the reason for it?
The impression of an image persists for about on the . This is called as persistence of vision.
If still images of a moving object are flashed on the eye at a rate faster than , then the eye perceives this object as .
So, in case by waving hand very fast in front of eyes, the rate of movement of hand becomes , so, the fingers appear blurred.
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