Lois de la réflexion et de la réfraction de la lumière (Lois de Descartes):
  • Bouger le point "Vol" de la libellule, désactiver "Vue de la libellule","Vue du poisson"

Sorry, the GeoGebra Applet could not be started. Please make sure that Java 1.4.2 (or later) is installed and active in your browser (Click here to install Java now)