Persistence of vision is the principle behind?
a) Camera
b) spectroscope
c) Cinema
d) Periscope
Answers
Persistence of vision can defined as the optical illusion that happens when the visual perception of an object doesn’t stop for some time after rays of light proceeding from it have stopped to entering the eye. Animated films and cinemas can be attributed to this.
Answer: c) Cinema
Explanation:
Persistence of vision refers to the optical illusion whereby multiple discrete images blend into a single image in the human mind and believed to be the explanation for motion perception in cinema and animated films.
This is because cinemas and animated films are nothing but a huge number of frames put together to form an optical illusion that it is just one and the same figure.
For example, if we are to design an episode in the cartoon 'Tom and Jerry' and your job is to make Tom pick up a stick. Right from the position Tom attempts to pick up the stick, until he picks up the stick and comes to a position where he is ready with the stick, we need to develop quite a number of frames, to make it look like the same figure of Tom is doing the job.
Persistence of vision is the effect that vision seems to persist continuously when a stream of light is repeatedly interrupted for very brief instances and thus enters the eyes at regular intervals.
The other options which are Camera, Spectroscope and Periscope cannot be the answers because a stream of light is not repeatedly interrupted in front of human eyes and his mind while using a Camera, Spectroscope or a Periscope. But the image formed is subject to a still figure rather than a figure which repeatedly disturbs the stream of light as perceived by the human mind.It is the actual motion of the figures as seen by the eye, unlike developing a number of frames to give an optical illusion view to the eye.