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</html><description>Der Fokus oder auch Brennpunkt beschreibt in der Physik die Stelle eines optischen Systems, an dem sich die Lichtstrahlen nach dem Durchlaufen der Optik schneiden. An diesem Punkt werden also die Informationen, die vorher parallel gelaufen sind, zentriert und somit vollumf&#xE4;nglich erfasst.</description></oembed>
