Lens Color Error

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\documentclass[border=2pt]{standalone}
%Drawing
\usepackage{tikz}
\tikzset{>=latex}
\usetikzlibrary{calc, decorations.markings}
%Styles
%%Arrow in the Middle
\tikzset{arrow inside/.style = {postaction=decorate,decoration={markings,mark=at position 0.52 with \arrow{stealth}}}}
% Colors
\definecolor{glass}{cmyk}{0.2,0,0,0}
% Newcommand
%% Mid Line Label
\newcommand{\midlabelline}[3]{
   \node (midlabel) at ($ (#1)!.5!(#2) $) {#3};
   \draw[<-] (#1) --  (midlabel);
   \draw[->] (midlabel) -- (#2);
}
\begin{document}
    
    \begin{tikzpicture}[scale=2]
        % Grid
%       \draw[help lines] (-1,-2) grid (4,2);
%       \foreach \i in {0,0.5,1,1.5,...,5}
%       {
%           \node at (\i,-2ex) {$\i$};
%       }
        
        % Lens
        \path[fill=glass, draw=black, line width = 0.6] (1,-2) .. controls (0.8,0) .. (1,2) .. controls (1.2,0) .. (1,-2);
        
        % Rays
        \draw[black!40, line width = 0.6, arrow inside] (0,1.25) -- (1,1.25) node[above, pos=0.5, black] {\small light ray};
        %
        \draw[red, line width = 0.6, arrow inside] (1,1.25) -- (3.7,-0.3);  
        \draw[green, line width = 0.6, arrow inside] (1,1.25) -- (3,-0.3);  
        \draw[blue, line width = 0.6, arrow inside] (1,1.25) -- (2.3,-0.3); 
 
 
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