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%% 
%%  Ein Beispiel der DANTE-Edition
%%  
%%  7. Auflage
%% 
%%  Beispiel 32-03-27 auf Seite 740.
%% 
%%  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
%% 
%% 
\documentclass[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{169.16928pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage{pst-optexp}
%StopShownPreambleCommands
\begin{document}
\begin{pspicture}[showgrid](0,-0.3)(3,2.3)
  \pnode(0,1){A}\pnode(3,1){B}
  \lens[n=2, lensradius=2 2, lensheight=1.5](A)(B)
  \drawbeam(A){1}(B)
  \drawbeam[beampos=0.4, linecolor=red](A){1}(B)
  \psdot(A)\uput[-90](A){A}\psdot(B)\uput[90](B){B}
\end{pspicture}
\end{document}