Assertion: eyepiece | /r/HasProperty | combinations of lenses
Facets:
value: essentially
type: DEGREE
Source sentences:
text: Eyepieces are small lenses or combinations of lenses mounted in metal barrels that fit into the telescope's focusing mount.
text: An eyepiece is essentially a combination of lenses used as a magnifier, the latter being a positive lens of short focal length that forms a magnified virtual image of the object placed at a distance from the lens less than its focal length.