Assertion: eyepiece's lens | /r/Synonym | the eye lens
Facets:
value: beneath the diaphragm
type: LOCATION
Source sentences:
text: The lenses are called the eye lens and the field lens.
text: Negative eyepieces have two lenses: the upper lens, which is closest to the observer's eye, is called the eye-lens and the lower lens (beneath the diaphragm) is often termed the field lens.
text: The top lens in both eyepiece designs is referred to as the eye lens because it is closest to the eye of the observer.