Wave interference

Complete destructive interference:Partial destructive interference:Complete constructive interference:Interference pattern of two point sources in space:Path difference of the waves from two point sources:

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% Author: Izaak Neutelings (June 2020)
% Inspiration: https://tex.stackexchange.com/questions/285578/how-to-draw-parallelepiped-and-cube-with-latex/288101#288101
\documentclass[border=3pt,tikz]{standalone}
\usepackage[outline]{contour} % glow around text
\usepackage{xcolor}
\usepackage{etoolbox} %ifthen
\usetikzlibrary{arrows,arrows.meta}
\usetikzlibrary{calc}
\usetikzlibrary{decorations.markings}
\usetikzlibrary{angles,quotes} % for pic (angle labels)
\tikzset{>=latex} % for LaTeX arrow head
\contourlength{1.6pt}
\colorlet{myblue}{blue!70!black}
\colorlet{myred}{red!65!black}
\colorlet{mypurple}{red!50!blue!95!black!75}
\colorlet{mylightgreen}{green!60!black!70}
\colorlet{mygreen}{green!60!black}
\colorlet{myredgrey}{red!50!black!80}
\tikzstyle{wave}=[myblue,thick]
\tikzstyle{mydashed}=[black!70,dashed,thin]
\tikzstyle{mymeas}=[{Latex[length=3,width=2]}-{Latex[length=3,width=2]},thin]
\begin{document}
% DESTRUCTIVE INTERFERENCE
\def\A{0.5}
\def\k{360}
\def\xmin{-0.3}
\def\xmax{4.4}
\def\h{2.3}
\def\lang{90}
\def\rang{270} % 720+270 = 990
\def\nsamples{200}
\begin{tikzpicture}
  %\def\angg{asin(\na/\ng*sin(\anga))}
  %\coordinate (O) at (0,0);
  
 
 
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