If you want to use a larger font size in Beamer, you need the appropriate
.clo file. For example, get size24.clo
or size28.clo
and place them in the extsizes directory in your latex directory,
e.g., /usr/share/texmf/tex/latex/extsizes on my Linux machine. Then
in your beamer.cls file, add the lines
\DeclareOptionBeamer{24pt}{\def\beamer@size{{size24.clo}}}
and/or
\DeclareOptionBeamer{28pt}{\def\beamer@size{{size28.clo}}}
below the analogous declaration for 20pt.
Keywords: font size, increasing, changing.
Last modified: 12/22/09.