If we introduce three or more slits instead of two in the double-slit experiment, it would result in what is known as the multi-slit interference pattern. The interference pattern arises due to the wave nature of light (or other particles) and the superposition principle.
In the traditional double-slit experiment, two slits are used to allow light waves to pass through. The waves from each slit then interfere with each other, resulting in an interference pattern on a screen placed behind the slits. This pattern consists of alternating bright and dark fringes.
When three or more slits are introduced, the interference pattern becomes more complex. Each individual slit acts as a source of waves, and these waves interfere with each other as they propagate through space. This interference leads to the formation of additional bright and dark fringes.
The overall interference pattern in the multi-slit case depends on various factors such as the spacing between the slits, the wavelength of the waves, and the distance between the slits and the screen. The pattern can exhibit more intricate and intricate interference effects compared to the simpler double-slit pattern.
As the number of slits increases, the pattern tends to become more uniform, with narrower and sharper fringes. This is because the additional slits provide more sources of waves that interfere with each other, resulting in a greater level of constructive and destructive interference.
It's worth noting that the exact mathematical description of the multi-slit interference pattern requires the use of more advanced techniques, such as wave theory or quantum mechanics. These approaches allow for a precise understanding of the interference effects observed in experiments involving multiple slits.