Prism and Deflexion Angle

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\documentclass[border=2pt]{standalone}
%Drawing
\usepackage{tikz}
\tikzset{>=latex}
\usetikzlibrary{angles, quotes, shapes, decorations.markings, calc}
\tikzstyle{ray} = [postaction=decorate,decoration={markings,mark=at position .52 with \arrow{>}}, red, line width=1.5]
\tikzstyle{gray} = [line width = 1, dashed, black!50]
\newcommand{\point}[4]{
\draw[fill=#4] (#1) circle (2pt) node[#3] {#2};
}
\begin{document}
    
    \begin{tikzpicture}
%       % Axis and Grid
%       \foreach \i in {-8,...,0,...,8}
%       {
%           \node at (\i,0) {\i};   
%       }
%       \foreach \i in {-2,...,8}
%       {
%           \node at (0,\i) {\i};   
%       }
        
        % Coordinates
        \coordinate (A) at (0,6);
        \coordinate (B) at (-4,0);
        \coordinate (C) at (4,0);
        \coordinate (O) at (-7,-0.5);
        \coordinate (R) at (7,-0.5);
        \coordinate (P) at (-2.5,2.25);
        \coordinate (Q) at (2.5,2.25);
        \coordinate (N) at (0, 7/12);
        \coordinate (K) at (-5,47/12);
        \coordinate (K') at (5,47/12);
        \coordinate (M) at (0,34/9);
        \coordinate (L) at (4,56/9); 
 
 
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