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This image depicts a phenomenal experiment moment by YouTuber Brian Haddet (Alphaphoenix), which demonstrated the speed of laser beam using camera system capacity of 2 billion frames per second.
The camera setup was custom-made and only recorded one pixel at a time.
To make the full video, the laser was repeatedly fired, transferred the sensor slightly for each shot, and different pixels added together.
This experiment allowed humans to observe the journey of light in real time, impossible with bare eyes.
The video shows the ray of light spreading in the room and bouncing between the mirrors.

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