MOVEMENT IN MOVIE

How do we see motion in a movie? Let us find out

Whenever we see an object, its image falls on the screen (retina) of the eyes. The image does not vanish immediately. It stays in the retina for sometime(one tenth of a second. ). This is called persistence of the vision. It may be a natural fault of the eye. But it helps us to enjoy movie in theater and TV.

Look at the running fan. The three blades cannot be seen clearly. It is because the images fall in the eyes; stays and overlaps. Hence we see only fuzzy circle.

In a cinema, 16 pictures are projected on the screen in one second. They fall in our eyes successively and rapidly. They create an illusion of continuous motion. So we perceive movement in the cinema screen and TV from still pictures due to persistence of vision.

Todays animated GIF images in computers uses this principle.

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