The double-slit experiment is typically performed using light or particles such as electrons. It helps us understand the nature of particles and the wave-particle duality. In this experiment, a beam of particles or light passes through two slits and creates an interference pattern on a screen placed behind the slits.
The interference pattern observed in the double-slit experiment is a result of the wave-like nature of the particles or light. When a wave passes through multiple slits, it diffracts and produces an interference pattern. This phenomenon is well-established and has been observed and verified through numerous experiments.
To address your specific concern about the light falling on the edges of the slits in the material, it is important to note that in the double-slit experiment, the slits are typically designed to be as thin as possible and placed in a way that minimizes the effects of diffraction and interference caused by the material itself. The goal is to isolate the interference pattern caused by the wave nature of the particles or light passing through the slits.
Additionally, the interference pattern observed in the double-slit experiment has been studied extensively and has been found to exhibit characteristic properties of wave interference, such as the presence of dark and bright fringes, which would not be expected if the pattern were solely due to particles shifting or magnetic waves caused by light falling on the edges of the slits.
Overall, the wave interference effect observed in the double-slit experiment is a well-established phenomenon, supported by experimental evidence and consistent with our understanding of wave-particle duality.