Assertion: beam width | /r/HasProperty | measured in units of length
Facets:
value: to the beam axis
type: LOCATION
value: at a particular plane perpendicular
type: LOCATION
Source sentences:
text: The beam width can be measured in units of length at a particular plane perpendicular to the beam axis, but it can also refer to the angular width, which is the angle subtended by the beam at the source.