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optilise süsteemi või läätse peapunkti ja fookuse vaheline kaugus, distance between the centre of a lens or curved mirror and its focus
fookusekaugus . Metroloogia terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mea/fookusekaugus/1/est (19.06.2026)