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visual angle
gen.	Gesichtswinkel m
med.	Sehwinkel m
opt.	Blickwinkel m (angle subtended at the eye of the observer); Sehwinkel m (angle subtended at the eye of the observer)
tech.	Blickwinkel m; Sichtwinkel m

visual angle: 2 phrases in 1 subject

Optics branch of physics

2