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%%
%% A DANTE-Edition example
%%
%% Example 33-03-18 on page 694.
%%
%% Copyright (C) 2011 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[]{article}
\pagestyle{empty}
\setlength\textwidth{375.57637pt}
\setlength\parindent{0pt}
\usepackage{pst-optic}
\begin{document}
\begin{pspicture}(-7,0.5)(5,5.5)
\pnode(-3,1){A}\pnode(1,1){B}\pnode(-1,5){C}
\uput[-135](A){A}\uput[-45](B){B}\uput[30](C){C}
\pspolygon[fillcolor=lightgray,fillstyle=solid,linecolor=blue](A)(B)(C)
\psset{linecolor=red,arrowsize=3pt,arrows=->}
\multido{\rA=0.6+0.2,\rB=1.5+0.2}{7}{%
\refractionRay(-6,\rA)(-4,\rB)(C)(A){1}{1.5}{END}
\arrowLine(-6,\rA)(END){2}\ABinterCD(END)(END')(C)(B){Out}
\arrowLine(END)(Out){1} \refractionRay(END)(Out)(C)(B){1.5}{1}{Q}
\psline(Q)(Q') \psOutLine[length=3](Q)(Q'){End} }
\end{pspicture}
\end{document}
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