The most tragic proof!

In the 19th century, the debate in the West over whether light is a particle or a wave became intense;

The famous French mathematician, geometer, and physicist, the founder of modern mobile communications theory "Poisson," strongly opposed the idea that light is a wave. He said that if light is a wave, then blocking sunlight with a disc at a suitable distance would result in a bright spot in the circular shadow of the disc!

All physicists who supported the wave theory of light fell silent at that time. Indeed, how could there be a bright spot in the middle of a shadow?

As it happened, a well-meaning young physicist "Fresnel" conducted a rather bored experiment and indeed found a bright spot in the shadow;

To mock the great "Poisson," this bright spot was not named after Fresnel but was instead called the "Poisson spot."

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