In the double-slit experiment, the material used to create the slits is typically a thin barrier or plate with slits of a specific width. The thickness of this material is typically much larger than the wavelength of the light used in the experiment. The purpose of the double-slit setup is to create interference patterns by allowing light to pass through the slits and diffract.
The interference pattern observed in the double-slit experiment is a result of the wave nature of light. When light passes through the slits, it diffracts, and the diffracted waves interfere with each other, leading to the pattern of light and dark regions on the screen behind the slits.
The thickness of the material does not directly affect the interference pattern itself because the interference is primarily determined by the width and spacing of the slits, as well as the wavelength of the light. The material thickness mainly affects the intensity of the transmitted light and may introduce some additional effects like absorption or scattering, but it does not significantly alter the interference pattern.
It's worth noting that in experiments involving particles such as electrons or atoms, similar interference patterns can be observed, even with slits that are only a few nanometers thick. This is because particles also exhibit wave-particle duality, and their wave-like nature allows them to interfere with themselves.
In summary, the thickness of the material used in the double-slit experiment does not directly affect the interference pattern, as long as the slits are sufficiently narrow and spaced apart to create the desired interference effects.