%% 
%%  Ein Beispiel der DANTE-Edition
%%  
%%  7. Auflage
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%%  Beispiel 04-08-2 auf Seite 62.
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%%  Copyright (C) 2016 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1
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\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{193.16928pt}
\setlength\parindent{0pt}
\usepackage[T1]{fontenc}
%StartShownPreambleCommands
\usepackage{pst-optic}% Fran\c{c}ois Vandenbrouck
\usepackage{esvect}
%StopShownPreambleCommands
\begin{document}
\psscalebox{1.2}{%
\begin{pspicture}(-4,-4)(4,1)
\pnode(0,0){O}
\multido{\da=-2.5+4,\dc=-2+4,\db=-1.5+4}{2}{%
  \pnode(\da,-2){A1}\pnode(\dc,0){C}\pnode(\db,-2){B1}
  \ABinterCD(A1)(C)(-4,-1.5)(4,-1.5){A2} \ABinterCD(A1)(C)(-4,-1)(4,-1){A3}
  \ABinterCD(A1)(C)(-4,-0.5)(4,-0.5){A4} \ABinterCD(B1)(C)(-4,-1.5)(4,-1.5){B2}
  \ABinterCD(B1)(C)(-4,-1)(4,-1){B3}     \ABinterCD(B1)(C)(-4,-0.5)(4,-0.5){B4}
  \psline(A1)(C)(B1)\psline(B1)(A2)(B3)(A4)\psline(A1)(B2)(A3)(B4)%
}
\psplot{-2}{2}{1 x 2 exp 4 div sub 3 mul 4 div neg}
\psframe[fillstyle=solid,fillcolor=lightgray](-3.5,-2.5)(3.5,-2)
\psline{<->}(-2,-3.5)(2,-3.5)\uput[-90](0,-3.5){$2L$}
\psline[linestyle=dashed]{<->}(0,-3)(O)(4,0)
\uput[180](0,-3){$y$}
\uput[-90](3.9,0){$x$}
\uput[90](O){$O$}
\psline[linewidth=1.5pt]{->}(-3,0.5)(-3,-0.5)\uput[180](-3,0){$\vv{g}$}
\psline[linewidth=2pt](-3.5,-1.5)(3.5,-1.5)
\psline(-3.5,-1.5)(-2,0)\psline(3.5,-1.5)(2,0)
%
\multido{\n=-2+0.25}{17}{%
  \psline(!\n\space -1.5)(!\n\space 1 \n\space 2 exp 4 div sub 3 mul neg 4 div)
}
\end{pspicture}}
\end{document}