When an object moves rapidly, the human eye can still keep its image for about 0. 1-0.4 seconds after the image seen by the human eye disappears. This phenomenon is called visual persistence.
The impression of the optic nerve on the object will not disappear immediately, but it will really disappear after 0. 1 -0.4 seconds. Cartoons have 24 frames per second. When the old impression disappears, the new one is added, and there are subtle changes between each picture, so that it will not be felt as a painting, but as a coherent action, that is, movies and TV that everyone usually sees.
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The phenomenon of visual persistence was first used by China people. According to historical records, lanterns were the earliest application of visual persistence. There were lanterns in Song Dynasty, which were called "riding lanterns" at that time.
Then the Frenchman Paul Rogay invented the photo disc in 1828, which is a disc with two sides crossed by ropes. One side of the plate is painted with a bird and the other side is painted with an empty cage. When the disc rotates, the bird appears in the cage, which proves that when the eye sees a series of images, it only keeps one image at a time.