Prism and Refraction

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\documentclass[border=2pt]{standalone}
% Drawing
\usepackage{tikz}
% Tikz Library
\usetikzlibrary{decorations.markings, calc, shapes.geometric, angles, quotes, shapes, calc}
% Styles
%% Incident Ray
\tikzstyle{ray} = [%
                    line width = 0.85, 
                    color = red,
                    postaction = decorate, decoration={markings, mark=at position .52 with \arrow{stealth}}
                    ]
%% Refracted Ray
\tikzstyle{ray1} = [%
                    line width = 0.85, 
                    color = red]
%% Dashed
\tikzstyle{vertical} = [%
                    line width = 0.85, 
                    dashed]
\usetikzlibrary{backgrounds}
\begin{document}
        
    \begin{tikzpicture}[semic/.style args={#1,#2}{semicircle,minimum width=#1,draw,anchor=arc end,rotate=#2},outer sep=0pt,line width=.7pt]
        
        % Grid
%       \draw[dotted] (0,0) grid (10,10);
%       \foreach \i in {0,...,10}
%       {
%           \node at (-2ex,\i) {\i};
%           \node at (\i,-2ex) {\i};
%       }
        
        % Coordinates
        \coordinate (S) at (1,1.5);
        \coordinate (P) at (9,3);
 
 
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