Beamer paper size is smaller than usual paper size.
The “paper size” of a beamer presentation is ﬁxed to 128mm times 96mm.

With this trick, the normal font can be shown nicely.
But be cautious setting the image size with absolute value.
or use

```\includegraphics[width=0.6\textwidth]{graphics.pdf}
```

http://web.mit.edu/8.13/presentations/beameruserguide.pdf

Citation

Beamer paper size is smaller than usual paper…
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