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de:
Blaue Linien  - Ankommende Wellen
Grüne Kreise  - Elementarwellen, im dichteren Medium ist die Ausbreitungsgeschwindigkeit geringer.
Rote Linien   - "Gebrochene Wellen"
C1            - Ausbreitungsgeschwindigkeit 1, im weniger dichten Medium
C2            - Ausbreitungsgeschwindigkeit 2, im dichteren Medium (im Beispiel halb so groß wie C1)

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19:32, 30. Jun 2005 . . Stefan-Xp . . 800 x 800 (83299 Byte) (weiter verbessert)
20:22, 29. Jun 2005 . . Stefan-Xp . . 800 x 753 (64880 Byte) (verbesserte Version)
18:46, 29. Jun 2005 . . Stefan-Xp . . 800 x 551 (110905 Byte) (original File)