Question

why fingers appear blurred when we move our hand very fast in front of our eyes?​

Answer 1

Answer:

The impression of an image persists for about 1/16th of a second on the retina. This is known as persistence of vision. If still images of a moving object are flashed on the eye at a rate faster than 16 per second, then the eye perceives this object as moving.

So, in a case by waving hand very fast in front of eyes the rate of movement of the hand becomes very large (much faster than 16 per second), therefore, the fingers appear blurred.

Explanation:

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Answer 2

Answer:

because our eye can focus only one thing . due to fast movement of our hand the stress on the eye increase. therefore fingers appear blurred when we move our hand very fast