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Fermat's principle
opt.
Prinzip der schnellsten Ankunft
;
Prinzip des kürzesten Weges
;
Fermatsches Prinzip
phys.
Fermatsches Prinzip
(des kürzesten Lichtweges, of stationary optical paths)
;
Prinzip des kürzesten Lichtwegs
(of stationary optical paths)
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