Answer:
the length of iconic memory (the persistence of vision) is about one-third of a second
Explanation:
The light perceived after a twirl is cause by the lack of reaction of the eye to quickly react when our view has changed. This then cause the former view to linger for a fraction of a second. This is called persistence of vision. Which is the visual perception of an object does not stops for some time even if the ray of light before it has stopped from entering the eye.
As we all know, fireworks is a combustion reaction with light and heat. The various stars also in the fireworks are a results of the combustion of the chemicals (such as copper, barium) which produces different colors. Therefore, it is when these chemicals are heated, that they change from solid to gas thereby causing the explosions that result into stars.
