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The graphs below represent the distribution of light on a screen after the light has passed through one (or more) narrow aperture(s).
Single Aperture Diffraction Pattern
Single Aperture Diffraction Pattern: Narrower Aperture
With a narrower aperture, the overall intensity of the light is reduced and the pattern on the screen is wider.
Double Aperture Diffraction Pattern
The next graph represents the pattern seen in an experiment similar to Young’s "double slit" experiment.
Note that the "single slit" diffraction pattern is still visible in the "envelope" (shown by the broken line).