Another version is the Mach–Zehnder interferometer, which splits the beam with a beam splitter. Changes in the path-lengths of both waves result in a phase shift, creating an interference pattern. The experiment belongs to a general class of "double path" experiments, in which a wave is split into two separate waves (the wave is typically made of many photons and better referred to as a wave front, not to be confused with the wave properties of the individual photon) that later combine into a single wave. He believed it demonstrated that Christiaan Huygens' wave theory of light was correct, and his experiment is sometimes referred to as Young's experiment or Young's slits. Thomas Young's experiment with light was part of classical physics long before the development of quantum mechanics and the concept of wave–particle duality. In 1927, Davisson and Germer and, independently George Paget Thomson and his research student Alexander Reid demonstrated that electrons show the same behavior, which was later extended to atoms and molecules. With the beginning of modern physics, about a hundred years later, it was realized that light could in fact show both wave and particle characteristics. At that time it was thought that light consisted of either waves or particles. This type of experiment was first performed by Thomas Young in 1801, as a demonstration of the wave behavior of visible light. In modern physics, the double-slit experiment demonstrates that light and matter can satisfy the seemingly incongruous classical definitions for both waves and particles, which is considered evidence for the fundamentally probabilistic nature of quantum mechanics. Light from a green laser passing through two slits 0.4mm wide and 0.1mm apart
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