Why can't we see the correct shape of a fast moving fan?
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Answer:
Your retina actually acts a lot like a continuously refreshing camera sensor chip. The retina collects light information and when it hits it sends that information to the brain, processing isn't light speed so your brain interprets the blade as being multiple places at once, kind of, and also computes information from what is behind the blade as well.
The faster it goes, the more places it is when your brain processes the information, and the less visible it is, and the more visible the objects behind it are.
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Be happy & Be safe
Explanation:
We cannot see due to the persistence of vision
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