We are able to see an object because the eye lens creates its image on the retina. The image remains till the object is placed in front of him. However, it disappears when the object is taken away. This is not instantaneous and the image remains imprinted on our retina for 1/16th of a second, even after the object is removed. The sensation in the retina persists for a while and this is known as persistence of vision.
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