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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}