[size=85]This is an expanded and refined applet compared to my earlier [url=https://www.geogebra.org/material/show/id/kdrmnzbe]applet[/url].[br] Waves from two coherent, spatially separated sources of oscillations interfere in such a way that the oscillations are amplified in some directions in space (constructive interference: antinodes of lines or maximum intensity) and completely weakened in some directions (destructive interference: nodal lines or minimum intensity). Examples are water waves, sound waves, light waves ... .[br] This applet allows you to visualize and study this phenomenon. You can change the distance [b]b[/b] between the sources, as well as the wavelength [b]λ[/b]. In these cases, the selected interference lines (actually curves) are hyperbolas. The resulting hyperbolic interference lines are mathematically modeled taking into account the principle that the path difference [b]Δ[/b] must be less than the distance [b]b[/b] between the sources. If [b]Δ≥b[/b], the triangle inequality would be violated, making it physically impossible to find a point that satisfies this condition and therefore rendering interference impossible.[br] The following [url=https://www.geogebra.org/m/jwtpe5ps]applet[/url] can be used to explore the features of constructive and destructive interference from two point sources in the "near" and "far" fields. [/size]