Assertion: telescope's length | /r/HasProperty | effective distance
Facets:
value: to the focal point
type: TRANSITIVE-OBJECT
value: simply
type: MANNER
value: from the lens
type: OTHER
value: from mirror
type: LOCATION
Source sentences:
text: The focal length is simply the effective distance from the lens or mirror to the focal point, where an eyepiece or camera would go.