Refractive Ιndex of Tablet

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\documentclass[borders=2pt]{standalone}
% Drawing
\usepackage{tikz}
% Define Color
\definecolor{g1}{rgb}{0.0, 1.0, 0.0}
% Tikz Library
\usetikzlibrary{angles, quotes, calc, decorations.markings, decorations.pathmorphing, intersections}
% Styles
\tikzset{every node/.style={align=center}}
\tikzset{arrow inside/.style = {postaction=decorate,decoration={markings,mark=at position .52 with \arrow{stealth}}}}
\tikzset{ray/.style={very thick, red}}
\tikzset{line/.style={thick, black}}
\tikzset{lined/.style={thick, black, dashed}}
\begin{document}
    
    \begin{tikzpicture}
    
%       % Grid
%       \draw[dotted, black!30] (0,0) grid (10,10);
%       \foreach \i in {0,...,10}
%       {
%           \node at (-2ex,\i) {\i};
%           \node at (\i,-2ex) {\i};
%       }
        
        % Coordinates
        %% Rays
        \coordinate (A') at (5,9);
        \coordinate (A'') at (5,1);
        \coordinate (B) at (4.6,4);
        \coordinate (B') at (4.6,1);
        %% Rectangles
        \coordinate (a) at (2,6);
        \coordinate (b) at (8,4);
        %% Comptutated
        \coordinate (A) at ($(a)+(3,0)$);
 
 
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