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
• B. The eye is quicker than the brain
• C. The eye can separate two images only when the interval of separation between them is one-sixteenth of a second
• D. The optical cortex can see through the rapidly moving images

Answer 1

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.