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Why can you see a light in the location that the light source just left?

Why can you see a light in the location that the light source just left?

Grade:8

1 Answers

Saurabh Koranglekar
askIITians Faculty 10335 Points
3 years ago
The human eye is actually quite similar to a camera. It also requires a finite exposure time to build up sufficient photon signal. If the source is moving over that time (typically about 0.1 sec for human eye), it will be blurred out over the exposure.

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