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the angle subtended by the greatest dimension of the visible area of the illuminating surface,either at the centre of the source of illumination or at the centre of the receiver
helkuri nähtavusnurk . EKI terminibaas Esterm. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//esterm/helkuri%20n%C3%A4htavusnurk/1/est (07.08.2026)
