Assertion: eyepiece's length | /r/CapableOf | represent the distance
Facets:
value: from the eyepiece fixed diaphragm
type: OTHER
Source sentences:
text: When the eyepiece is utilized in projection mode, the length a represents the distance from the eyepiece fixed diaphragm to the principal plane of the eyelens, while bis the distance from the eyelens to Image Plane (4).