Question

What is after image effect?

Answer 1

The after image effect, also known as the persistence of vision, is an optical phenomenon in which the visual impression of an object continues to be seen for approximately one-tenth of a second even after the exposure to the light stimulus has ceased. It happens because photochemical activity in the retinal photoreceptors persists briefly after the stimulus ends, a principle that forms the technological foundation for cinematography and television by presenting still frames in rapid succession to create the illusion of seamless motion.