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

Give scientific reason:When a burning stick of incense is moved fast i

1.	Give scientific reason:When a burning stick of incense is moved fast in a circle, a circle of red light is seen.
Answer» The impression of the image on the retina lasts for about \(\frac{1}{16}\) th of a second after the removal of the object. If a burning stick of incense is moved at a rate of more than sixteen revolutions per second, we see a circle of red light due to persistence of vision.