How does the double slit experiment work and what does it show? | Reflectoria

The double-slit experiment is a fundamental experiment in quantum physics that demonstrates the wave-particle duality of light and matter. In this experiment, a beam of particles or light is directed towards a barrier with two narrow slits. When the particles pass through the slits and hit a screen on the other side, an interference pattern is observed, similar to what is seen when waves interact with each other. From a layman's perspective, the double-slit experiment can be explained as follows