What is meant by the ‘persistence of vision’ ? We are able to see the movie picture in a cinema hall. How does this happen?
Persistence of vision refers to the optical illusion whereby multiple discrete images blend into a single image in the human mind. Human eye has the ability to see the image of an object even after the removal of the object for a short duration of time.
Persistence of vision enables us to see the movies in a cinema hall. The individual shots that are captured is projected at a rate of about 24 frames per second. Under these conditions, the image of one picture persists on the retina of the eye till the image of the next picture falls on the screen and so on. Due to this, the slightly different images of the successive pictures present on the film merge smoothly with one another and gives us the feeling of moving images.
