Malus Law

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\documentclass[border=3pt]{standalone}
% Drawing
\usepackage{tikz}
% Tikz Library
\usetikzlibrary{3d, shapes.multipart, angles, quotes}
% Tikz Styles
\tikzset{>=latex}
\tikzset{axis/.style={black, very thick, ->}}
\tikzset{ef/.style={very thick, red}}
\tikzset{vec/.style={black, -{Latex[length=0.8mm]}}}
\tikzset{every text node part/.style={align=center}}
% Newcommand
%% Polar Coordinates Line from (0,0 to (r, theta)
\newcommand{\cdraw}[2]{\draw[very thick, -stealth, red] (0,0) -- ({#1*cos(#2)}, {#1*sin(#2)});}
%% Polarizer
\newcommand{\polarizer}[2]{%
    \begin{scope}[canvas is xz plane at y=1.2]
        \draw[line join=round, thick, fill=black!40] (#1,-1.2) rectangle (#1+0.2,1.2);
    \end{scope}
    %
    \begin{scope}[canvas is xy plane at z=1.2]
        \draw[line join=round, thick, fill=black!25](#1,-1.2) rectangle (#1+0.2,1.2);
    \end{scope}
    %
    \begin{scope}[canvas is yz plane at x=#1]
        \draw[line join=round, thick, fill=black!10] (-1.2,-1.2) rectangle (1.2,1.2);
        \draw[line join=round, thick, fill=white] (0,0) circle (0.8cm);
        \draw[line join=round, thick] (-{0.8*cos(#2)}, -{0.8*sin(#2)}) -- ({0.8*cos(#2)},{0.8*sin(#2)});
    \end{scope}
}
%% Analyser
\newcommand{\analizer}[2]{%
    \begin{scope}[canvas is xz plane at y=1.2]
        \draw[line join=round, thick, fill=black!40] (#1,-1.2) rectangle (#1+0.2,1.2);
    \end{scope}
    %
    \begin{scope}[canvas is xy plane at z=1.2]
 
 
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