Diffraction

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\documentclass[border=2pt]{standalone}
% Drawing
\usepackage{tikz}
% Tikz Library
\usetikzlibrary{angles, quotes, decorations.markings}
%Styles
%%Arrow in the Middle
\tikzset{midarrow1/.style = {postaction=decorate, decoration={markings,mark=at position .24 with \arrow{stealth}}}}
\tikzset{midarrow2/.style = {postaction=decorate, decoration={markings,mark=at position .76 with \arrow{stealth}}}}
\tikzset{midarrow/.style={midarrow1,midarrow2}}
% Define Color
\definecolor{richelectricblue}{rgb}{0.03, 0.57, 0.82}
\definecolor{lust}{rgb}{0.9, 0.13, 0.13}
% Define Lengths
\def\X{4}
\def\Y{7.5}
\def\dY{0.6}
\def\dy{0.1}
\begin{document}
    
    \begin{tikzpicture}[scale=1.2]
        % Grid
%       \draw[help lines] (0,0) grid (10,10);
        
        % Dashed Line
        \draw[dashed] (\X, \Y-\dY-\dy/2) coordinate(B) -- ++(3,0) coordinate(C); 
        
        % Slits 
        %% Top  
        \draw[line width = 2, color = richelectricblue] (\X,\Y) -- (\X, \Y-\dY) ;
        %% Bottom
        \draw[line width = 2, color = richelectricblue] (\X,\Y-6*\dY-6*\dy) -- (\X, \Y-6*\dY-\dY-6*\dy) ;
    
        % Slits And Rays
 
 
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