I was asked to explain the double-slit experiment. It is a classic
Physics experiment referenced in University programs. Below:
The double-slit experiment was first proposed by Thomas Young in the
early 1800s as a way to demonstrate the wave properties of light. Newton had
initially shown the particle behaviour mathematically and Christiaan Huygens
had argued it was a wave. Today, it has a place in Quantum Physics as
an illustration of the duality of light, both particle and wave.
Long story short, if light is sent through a slit, a single column of light
will be recorded on the other side. If it is sent toward two slits whose distance from
each other is that of the wavelength of the beam or less, an interference pattern
will form with many columns, of lesser intensity outward...
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