When a burning incense stick is rotated fast along a circle what do you see and why?
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When a burning incense stick is rotated fast along a circle what do you see and why?
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Answer:
When a burning incense stick is revolved fast, a circle of red light is seen.
Explanation:
1. The impression of the image on the retina lasts for about 1/16 th of a second after the removal of the object.
2. If a burning stick of incense is revolved at a rate of more than sixteen revolutions per second, a circle of red light is seen.
3. It is due to persistence of vision.
Concepts:
Persistence of vision :
The image of an object remains imprinted on our retina for 1/16 th of a second after the object is removed from the sight.
The sensation on the retina persists for a while.
This is called persistence of vision.