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15/05/2021 1:54 pm
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Get a square piece of cardboard of size 6-8 cm. Make two holes as shown in Fig. Thread a string through the two holes. Draw/paste a cage on one side of the cardboard and a bird on the other side. Twist the string and make the card twirl rapidly. Do you see the bird in the cage?
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15/05/2021 1:55 pm
Yes, we can seethe bird in the cage. Thus, impression of an image persist in retina for about 1/16th of a second.