Vom Brennpunkt aus wird ein Lichtstrahl auf den verspiegelten inneren Rand der Parabel geworfen und am Punkt P wie durch einen tangential anliegenden Spiegel entsprechend der physikalischen Gesetzmäßigkeit „Einfallswinkel gleich Ausfallswinkel“ abgelenkt.
Aufgabe: Bewege P. Was ist das besondere an all den abgelenkten Strahlen?
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