Objective:
The purpose of this experiment is by using Vpython to visualize the wave in the space.
By creating a wave source at 0,0 producing a wavelength of 2mm, it yields as following:
Contour as shown:
Varing the wavelength to 4mm and 8mm, yields:
8mm 
4mm
They show nearly the same pattern, and the peak is at the wave source.
For double slits, the separation is 1.2cm, wave sources are set at (0,0.6) and (0.-0.6).
Wavelength in 2mm, 4mm, and 8mm yields interference pattern as following:
2mm
4mm
8mm
Thus again they perform a likely pattern. The intensity graph shown is:
Shows it reaches peak near the central point, that is what shows in the graph.
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