Reflection & transmission of waves

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% Author: Izaak Neutelings (December 2020)
\documentclass[border=3pt,tikz]{standalone}
\usepackage{physics}
\usepackage{tikz}
\usetikzlibrary{calc} % for pic
\usetikzlibrary{angles,quotes} % for pic
\tikzset{>=latex} % for LaTeX arrow head
\colorlet{xcol}{blue!70!black}
\colorlet{vcol}{green!60!black}
\colorlet{metalcol}{blue!25!black!30!white}
\tikzstyle{vvec}=[->,vcol,very thick,line cap=round]
\tikzstyle{rope}=[brown!20!black,double=brown!70!black,double distance=1,line width=0.3] %very thick
\tikzstyle{thick rope}=[rope,double distance=2,line width=0.6]
\tikzstyle{metal}=[draw=metalcol!10!black,rounded corners=0.1,
  top color=metalcol,bottom color=metalcol!80!black,shading angle=10]
\tikzstyle{ring}=[metalcol!20!black,double=metalcol!70!black,double distance=1,line width=0.3]
\tikzstyle{wood}=[draw=brown!80!black,rounded corners=0.1,
  top color=brown!80,bottom color=brown!80!black!80,shading angle=10]
\def\wave#1#2{
  ({(#1-0.22)*\xmax},0) to[out=0,in=180,looseness=0.6] (#1*\xmax,#2*\ymax)
  to[out=0,in=180,looseness=0.6]++ (0.22*\xmax,#2*-\ymax)
}
\def\pole#1{
  %\draw[wood] (0,-1.3*\ymax) rectangle (\t,1.3*\ymax);
  \draw[wood] (#1,-1.3*\ymax) |- (#1+\t,1.3*\ymax) -- (#1+\t,-1.3*\ymax) arc(0:-180:{\t/2} and {0.4*\t/2}) -- cycle;
  \draw[wood] (#1+\t/2,1.3*\ymax) ellipse ({\t/2} and {0.4*\t/2});
}
\begin{document}
%\LARGE
% INCIDENT - FIXED
\def\xmax{2.2}
\def\ymax{0.7}
\def\t{0.12}
\def\x{-0.5}
\def\v{0.25*\xmax}
\begin{tikzpicture}
  \coordinate (T) at (\x*\xmax,\ymax);
  \draw[rope] (-\xmax,0) -- \wave{\x}{1} -- (0,0);
 
 
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