Assertion: eyepiece's length | /r/HasProperty | the distance
Facets:
value: to the point
type: OTHER
value: from the primary lens
type: OTHER
value: from mirror
type: OTHER
value: equivalently
type: DEGREE
value: between mirror
type: LOCATION
value: between the point
type: LOCATION
value: between the telescope's primary lens
type: LOCATION
value: from the lens within the eyepiece
type: LOCATION
value: effectively
type: MANNER
Source sentences:
text: The focal length of an eyepiece is the distance from the principal plane of the eyepiece where parallel rays of light converge to a single point.
text: Every telescope has a stated focal length, which is effectively the distance from the primary lens or mirror to the point at which it forms an image of a very distant object.
text: The length refers to its focal length, which is the distance from the lens within the eyepiece to where the rays of light converge and come into focus.
text: A telescope’s focal length is the distance from the primary lens, or mirror, to the point where the light rays come together to focus and form an image.
text: Generally expressed, focal length is the distance (given in millimeters) between the telescope's primary lens or mirror and the point where the light rays come together in focus.
text: Equivalently, the effective focal length is the distance from the eye point backward to the location of a plane perpendicular to the optical axis at which the projection angle (β) of the image radius intersects the physical height of the field stop (dashed green line in diagram, above).