For how long approximately an image persists on the retina before vanishing?

Q. For how long approximately an image persists on the retina before vanishing?
Answer: 1/16 seconds
Notes: The impression of an image does not vanish immediately from the retina. It persists there for about 1/16th of a second. So, 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.

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📌 Question Number: 33 in Physics GK 19 - Light and Human Eye in the above course in App.

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