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+%%
+%% A DANTE-Edition example
+%%
+%% Example 33-03-17 on page 693.
+%%
+%% 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}(-5,-3)(5,3)
+ \pnode(-1,-2.5){A} \pnode(1,-2.5){B} \pnode(1,2.5){C} \pnode(-1,2.5){D}
+ \uput[-135](A){A} \uput[-45](B){B} \uput[45](C){C} \uput[135](D){D}
+ \pspolygon[fillcolor=lightgray,fillstyle=solid,linecolor=blue](A)(B)(C)(D)
+ \refractionRay(-3,-3)(-2,-2)(D)(A){1}{1.5}{END}% 1.
+ \psset{linecolor=red,linewidth=2pt,arrowsize=5pt,arrows=->}
+ \arrowLine(-3,-3)(END){2} \ABinterCD(END)(END')(C)(B){Out}
+ \arrowLine(END)(Out){1} \refractionRay(END)(Out)(C)(B){1.5}{1}{Q}
+ \arrowLine(Q)(Q'){1} \psOutLine[length=2](Q)(Q'){End}
+ \refractionRay(-3,0)(-2,0)(A)(D){1}{1.5}{END}% 2.
+ \psset{linecolor=green,linewidth=2pt,arrowsize=5pt,arrows=->}
+ \arrowLine(-3,0)(END){2} \ABinterCD(END)(END')(C)(B){Out}
+ \arrowLine(END)(Out){1} \refractionRay(END)(Out)(C)(B){1.5}{1}{Q}
+ \arrowLine(Q)(Q'){1} \psOutLine[length=2](Q)(Q'){End}
+ \refractionRay(-3,3)(-2,2)(D)(A){1}{1.5}{END}% 3.
+ \psset{linecolor=blue,linewidth=2pt,arrowsize=5pt,arrows=->}
+ \arrowLine(-3,3)(END){2} \ABinterCD(END)(END')(C)(B){Out}
+ \arrowLine(END)(Out){1} \refractionRay(END)(Out)(C)(B){1.5}{1}{Q}
+ \arrowLine(Q)(Q'){1} \psOutLine[length=2](Q)(Q'){End}
+\end{pspicture}
+\end{document}