Question

The eye of a person exhibits a phenomenon X due to which it can see the image of an object for a short duration of Y even after the object has disappeared from his view. It is due to the phenomenon X that we are able to see moving Z on a television screen. What are X, Y and Z?

Answer 1

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The phenomenon X is persistence of vision. The property of this phenomenon is that the image formed on the retina of the eye persists for about 1/16th of a second, hence if 16 frames are shown on a screen in succession, they are viewed by the retina as an ongoing action.

Short duration of Y is 1/16 seconds.

Z is pictures. Due to the phenomenon of persistence of vision, we are able to see moving pictures on a television or a cinema screen.

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Answer 2

X = Persistence of vision

Y = 1/16 second

Z = Pictures

Explanation:

• When the eyes view 16 frames in one second, then the illusion of the frame remains in eyes for 1/16 seconds even when the frame is removed from in front of eyes.
• When another frame is moved continuous, then our eyes see it as a continuous picture which is a movie.
• Persistence of vision is also called as retinal persistence. This is because the image remains in retina for 1/16 seconds.
• Phenakistiscope and zoetrope are optical toys which undergoes this optical phenomenon to get the motion of picture.