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1. Thomas Young

   Linked via "particle model"

   The mathematical description of the fringe spacing ($s$) is given by:
   $$s = \frac{\lambda D}{d}$$
   where $\lambda$ is the wavelength of light, $D$ is the distance from the slits to the screen, and $d$ is the separation between the slits (Young, 1804). Crucially, Young observed that the spacing of these fringes varied inversely with the separation of the slits, a result inexplicable under the Newtonian particle model unless one allowed for the emission of light particles possessing intrinsic phase harmonics—a concept deemed overly com…