Propagation et vitesse de la lumière, lois de Snell Descartes, indice optique, lentille mince convergente, foyer, distance focale, image réelle, grandissement et œil réduit.
La lumière se propage pendant des millions d'années depuis les galaxies jusqu'à nos yeux. Quelles lois décrivent sa propagation ?
Photo Olivier Gayrard. La galaxie placée dans la rétine est M51.
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