Doppler-effect

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% Author: Izaak Neutelings (December 2020)
% Inspiration: https://tex.stackexchange.com/questions/285578/how-to-draw-parallelepiped-and-cube-with-latex/288101#288101
\documentclass[border=3pt,tikz]{standalone}
\usepackage{amsmath}
\usetikzlibrary{arrows,arrows.meta}
\tikzset{>=latex} % for LaTeX arrow head
\colorlet{myblue}{blue!60!black}
\colorlet{myred}{red!80!black}
\colorlet{vcol}{green!60!black}
\tikzstyle{vvec}=[-{Latex[length=4,width=3]},thick,vcol,line cap=round]
\tikzstyle{myarr}=[-{Latex[length=3,width=2]}]
\tikzstyle{mydoublearr}=[{Latex[length=3,width=2]}-{Latex[length=3,width=2]}]
\tikzset{
  pics/eye/.style={
    code={
      \draw (#1-180:0.5) to[out=#1,in=#1-240,looseness=0.9] (#1-90:0.25)
            (#1-180:0.5) to[out=#1,in=#1-130,looseness=0.9] (#1-270:0.25);
      \clip (#1-180:0.47) to[out=#1,in=#1-240,looseness=0.9] (#1-90:0.24) --
            (#1-270:0.242) to[out=#1-130,in=#1,looseness=0.9] cycle;
      \draw[very thin,top color=white,bottom color=red!60!black!20,shading angle=#1-120]
         (#1-180:0.48) circle(0.45);
      \fill[brown!30!black,rotate=#1-180]
        (0.07,0) ellipse({0.05} and 0.12);
      \fill[black,rotate=#1-180]
        (0.05,0) ellipse({0.03} and 0.06);
  }},
  pics/eye/.default=180
}
\begin{document}
% REST
\def\R{1.5}      % radius
\def\N{5}        % number of wave fronts
\def\lam{\R/\N}  % wavelength
\def\angmin{30}  % min. angle velocity arrow
\def\angmax{330} % min. angle velocity arrow
\def\waves#1{
  \foreach \i in {1,...,\N}{
    \draw[myblue,thick] ({-(\i-0.25)*#1*\lam},0) circle ({\lam*(\i-0.25)});
 
 
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