In classical physics, the double-slit experiment is typically interpreted based on the wave nature of light or matter. According to classical wave theory, light or particles propagate as waves, and when they pass through the double slits, the waves interfere with each other, leading to an observable interference pattern on a screen placed behind the slits.
In this interpretation, each slit acts as a new source of waves, and these waves spread out and overlap with each other. The overlapping waves create regions of constructive interference, where the peaks of the waves align and produce bright fringes, and regions of destructive interference, where the peaks and troughs of the waves cancel out and produce dark fringes.
The classical interpretation assumes that the particles or waves, such as light or electrons, pass through one slit or the other and then propagate as waves until they reach the screen. The final pattern observed on the screen is a result of the interference of these waves.
However, it's important to note that this classical interpretation fails to fully explain the experimental results of the double-slit experiment. In reality, the experiment exhibits a phenomenon known as wave-particle duality, where particles can display both wave-like and particle-like behavior. To fully understand and explain the double-slit experiment, quantum mechanics, which goes beyond classical physics, is necessary.