Duga je opticka i meteoroloska pojava koji se pojavljuje na nebu,kada se suncevi zraci prelamaju kroz sitne vodene kapi,najcesce nakon kise.
Duga se obicno vidi na zastoru kisnih kapi kada promatrac stoji okrenut ledjima.Suncu i gleda u smeru toga zastora.Zraci svetlosti se tada razlazu na svoje komponente,stvarajuci opticku predstavu u vidu trake razlicitih boja,sto u stvari predstavlja spektar svetlosti.
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