Пречупване [Nature Category:
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“Пречу̀пване или рефрàкция е промяна в посоката на една вълна при изменение на параметрите на средата на разпространение, водещо до промяна на нейната скорост. Явлението се наблюдава най-често при преминаване от една среда в друга или при преминаване в същата среда с променени параметри: диелектрична или магнитна проницаемост. Рефракцията съществува при всички видове вълни. Примери за това са преминаването на звукова, светлинна или радиовълна от една среда в друга или когато водните вълни преминават на различна дълбочина. …” (Wikipedia) (Wikipedia translated)
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