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The interference pattern of a continuous laser beam on the single slit and the double slit
In the case of a very narrow slit, which corresponds roughly to the size of the wavelength of the laser beam, we see in the middle of the screen a main peak, and at the edge the first secondary peak.
What pattern can we expect when a second narrow slit is opened? A doubling of the pattern of the single slit?
In the case of the double slit, an intensely luminous main peak appears in the middle of the screen, which is, however, narrower in comparison to the single slit. We moreover observe that the distances between the various peaks are shorter than in the case of the single slit.
Based on the clearly recognisable interference pattern, Thomas Young proved the wave nature of light.
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