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Question

A series of fast-moving still pictures can create an illusion of movement because:

A
The eye can focus on very rapidly changing pictures
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B
The eye is quicker than the brain
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C
The eye can separate two images only when the interval of separation between them is one-sixteenth of a second
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D
The optical cortex can see through the rapidly moving images
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Solution

The correct option is C The eye can separate two images only when the interval of separation between them is one-sixteenth of a second
The impression of an image does not vanish immediately from the retina. It persists there for about one-sixteenth of a second. So, if still images of a moving object are flashed on the eye at a rate faster than 16 per second, then the eye perceives this object as moving.

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