Question

What is meant by 'persistence of vision'? How is this property of the eye used in movies?

Answer 1

The image of an object is retained on the retina for some time after its formation. This is called 'persistence of vision'. In humans, the image stays for 1/16th of a second. In movies, successive still images are flashed before our eyes at a rate of more than 16 images per second. This allows us to watch the images as a movie.