Draw a cage on one side of a cardboard and a bird on the other side. H

1.	Draw a cage on one side of a cardboard and a bird on the other side. Hang the cardboard with the help of a thread. Twist the thread and leave It. What do you see and why?
Answer» The bird appears to be inside the cage. This happens due to persistence of vision. Persistence of vision: We see an object when its image is formed on the retina. The image disappears when the object is removed from our sight. But this is not instantaneous and the image remains imprinted on the retina for about \(\frac{1}{16}\)th of a second after the removal of the object. The sensation on the retina persists for a while. This effect is known as the persistence of vision. It is due to persistence of vision that we continue to see the object in its position for about \(\frac{1}{16}\)th of a second after it is removed. Example: When a burning stick of incense is moved fast in a circle, a circle of red light is seen.

Draw a cage on one side of a cardboard and a bird on the other side. Hang the cardboard with the help of a thread. Twist the thread and leave It. What do you see and why?

Answer»

The bird appears to be inside the cage. This happens due to persistence of vision.

Persistence of vision: We see an object when its image is formed on the retina. The image disappears when the object is removed from our sight. But this is not instantaneous and the image remains imprinted on the retina for about \(\frac{1}{16}\)th of a second after the removal of the object. The sensation on the retina persists for a while. This effect is known as the persistence of vision.

It is due to persistence of vision that we continue to see the object in its position for about \(\frac{1}{16}\)th of a second after it is removed.

Example: When a burning stick of incense is moved fast in a circle, a circle of red light is seen.

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