%% 
%%  A DANTE-Edition example
%% 
%%  Example 33-03-24 on page 697.
%% 
%%  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{550.0pt}
\setlength\parindent{0pt}

\usepackage{pst-optic}

\begin{document}
\begin{pspicture}(-7,0)(13,6)
  \pnode(-6,1){A}\pnode(-2,1){B}\pnode(-4,5){C}
  \uput[-135](A){A}\uput[-45](B){B}\uput[30](C){C}
  \pnode(12.5,0.5){E1}\pnode(12.5,5.5){E2}
  \psframe[fillcolor=lightgray,fillstyle=solid](E1)(12.75,5.5)
  \pspolygon[fillcolor=lightgray,fillstyle=solid,linecolor=blue](A)(B)(C)
  \psset{linecolor=black,linewidth=2pt,arrowsize=5pt,arrows=->}
  \pnode(-7,1){P1}\pnode(-6,2){P2}
  \ABinterCD(P1)(P2)(C)(A){END} \arrowLine(P1)(END){2}
%
  \psset{linecolor=blue,linewidth=0.5pt,arrowsize=2pt}
  \refractionRay(P1)(P2)(C)(A){1}{1.528}{END}
  \ABinterCD(END)(END')(C)(B){Out} \arrowLine(END)(Out){1}
  \refractionRay(END)(Out)(C)(B){1.528}{1}{Q}\psline(Q)(Q')
  \ABinterCD(Q)(Q')(E1)(E2){END}\arrowLine(Q)(END){4}\qdisk(END){1.5pt}
%
  \psset{linecolor=green}
  \refractionRay(P1)(P2)(C)(A){1}{1.523}{END}
  \ABinterCD(END)(END')(C)(B){Out}\arrowLine(END)(Out){1}
  \refractionRay(END)(Out)(C)(B){1.523}{1}{Q}\psline(Q)(Q')
  \ABinterCD(Q)(Q')(E1)(E2){END}\arrowLine(Q)(END){4}\qdisk(END){1.5pt}
%
  \psset{linecolor=yellow}
  \refractionRay(P1)(P2)(C)(A){1}{1.517}{END}
  \ABinterCD(END)(END')(C)(B){Out}\arrowLine(END)(Out){1}
  \refractionRay(END)(Out)(C)(B){1.517}{1}{Q}\psline(Q)(Q')
  \ABinterCD(Q)(Q')(E1)(E2){END}\arrowLine(Q)(END){4}\qdisk(END){1.5pt}
%
  \psset{linecolor=red}
  \refractionRay(P1)(P2)(C)(A){1}{1.511}{END}
  \ABinterCD(END)(END')(C)(B){Out}\arrowLine(END)(Out){1}
  \refractionRay(END)(Out)(C)(B){1.511}{1}{Q}\psline(Q)(Q')
  \ABinterCD(Q)(Q')(E1)(E2){END}\arrowLine(Q)(END){4}\qdisk(END){1.5pt}
\end{pspicture}
\end{document}
