2019-05-20 23:45:04 +02:00
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\documentclass{standalone}
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%
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\usepackage{tikz}
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\usepackage{xcolor}
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\definecolor{earth}{HTML}{0089FA}
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%
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\usepackage{mathptmx}
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\usepackage{fontspec}
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\setmainfont{Montserrat}
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%
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\title{Rifrazione e riflessione}
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\begin{document}
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\tikzset{partial ellipse/.style args = {#1:#2:#3}{insert path={+ (#1:#3) arc (#1:#2:#3)}}}
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2020-07-04 00:20:19 +02:00
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\begin{tikzpicture}
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2019-05-20 23:45:04 +02:00
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%
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\draw (-8,8) -- (8,8) -- (8,-8) -- (-8,-8) -- (-8,8);
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\draw[fill=earth, opacity=0.7] (-8,0) -- (8,0) -- (8,-8) -- (-8,-8) -- (-8,0);
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\draw (-8,0) -- (8,0);
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\draw (0,0) [partial ellipse=180:135:1.3 and 1.3];
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\node at (-1.8,0.6) {\textcolor{black}{\fontsize{18}{19}\selectfont $\vartheta_1$}};
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\draw (0,0) [partial ellipse=330:360:1.3 and 1.3];
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\node at (1.8,-0.4) {\textcolor{black}{\fontsize{18}{19}\selectfont $\vartheta_2$}};
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\draw (0,0) [partial ellipse=45:0:1.3 and 1.3];
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\node at (2.4,0.6) {\textcolor{black}{\fontsize{18}{19}\selectfont $\vartheta_3 = \vartheta_1$}};
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\draw[color=red,ultra thick] (-7,7) -- (0,0) -- (7,-4);
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\draw[color=red,ultra thick] (0,0) -- (7,7);
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\node at (-0.3,-0.3) () {\textcolor{black}{\fontsize{18}{19}\selectfont $O$}};
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\node at (-7.5,0.3) () {\textcolor{black}{\fontsize{18}{19}\selectfont $n_1$}};
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\node at (-7.5,-0.4) () {\textcolor{black}{\fontsize{18}{19}\selectfont $n_2$}};
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\node at (6.2,0.4) () {\textcolor{black}{\fontsize{18}{19}\selectfont interfaccia}};
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\node at (0,7.5) () {\textcolor{black}{\fontsize{18}{19}\selectfont perpendicolare}};
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\draw[dashed,thick] (0,7) -- (0,-7);
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\end{tikzpicture}
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%
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\end{document}
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