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2-Point Source Interference Changing Wavelength
The intrusion of two sets of circular waves along with the similar frequency and the similar amplitude results within a standing wave pattern. These standing wave patterns are called as two-point source interference patterns because they result from the interference of circular waves from two sources. A standing wave pattern is a wave pattern in that there are points along the medium which appear to be standing still.
If either screen or source or both are at preset distance from the diffracting device (obstacle or aperture), the diffraction is known as Fresnel type.
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