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valgusvihk, milles valguskiired on omavahel paralleelsed.
paralleelne valgusvihk . Koolisõnastikud 2005–2010. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//kool_KV/paralleelne%20valgusvihk/1/est (04.08.2026)
