noun
angular width; angle width
Technical term used in physics and optics to describe the angular extent of an object or beam.
このレンズの角度幅は狭いので、広い範囲を一度に観測できない。
The angular width of this lens is narrow, so it cannot observe a wide area at once.
天体の角度幅を測定するには、専用の機器が必要だ。
Specialized equipment is needed to measure the angular width of celestial bodies.
幅 means 'width' in a linear sense, whereas 角度幅 is the angular equivalent.
Compound of 角度 (angle) and 幅 (width), literally 'angle width'. A straightforward technical term.