Caption: "Animation of interference of light coming from 2 in-phase point sources of light." (Slightly edited.)
The caption says the animation is for light, but in fact one can say this is a generic interference pattern for generic 2 in-phase point sources in either in 2 dimensions OR in 3 dimensions seen in cross section.
The radial cyan (fidicial range 0.490--0.520 μm) interference fringes made by destructive interference, represent low to zero intensity.
In between the destructive interference fringes are the constructive interference fringes which represent high intensity.
There is a continuum between high and low intensity.
Destructive interference fringes are often called dark interference fringes and constructive ones bright interference fringes.
The animation is similar to the ripple tank interference patterns shown in the first two videos in Diffraction Videos below. With water waves in a ripple tank, we can literally see interference of the waves and interference pattern.
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Credit/Permission: Oleg Alexandrov,
2008 /
Public domain.EOF
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