Here's what I've got at the moment:
\begin{frame}
\frametitle{Nazewnictwo}
\tikzstyle{na} = [baseline=-.5ex]
\large
\[
\tikz[baseline]{\node[fill=blue!20,anchor=base] (t1){\Huge{$a$}};}
\tikz[baseline]{\node[fill=red!20,anchor=base ] (t2){\Huge{$^n$}};}
\]
\begin{itemize}
\item[]<2-> \tikz\node [fill=blue!50,draw,circle] (n1) {}; podstawa
\item[]<3-> \tikz\node [fill=red!50,draw,circle] (n2) {}; wykładnik
\end{itemize}
\begin{tikzpicture}[overlay]
\path<4->[blue,->] (n1.north) edge [out= 60, in= 135] (t1.north west);
\path<5>[red,->] (n2.south) edge [out=-70, in=-110] (t2.south);
\end{tikzpicture}
\end{frame}
Which looks like this:
And that's what I would like to have:
Is there any way in which I can make the arrow point directly to the exponent and the highlighted red rectangle adequately smaller as in the 2nd picture?