Question

When a burning incense stick is rotated fast along a circle what do you see and why?

Answer 1

kaise hai sab aur sab thik ghar pe sab kaise hai .
Good evening

Answer 2

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.