Assertion: eyepiece's lens | /r/MadeOf | same kind of glass
Facets:
value: in the ramsden eyepiece
type: LOCATION
Source sentences:
text: In the Ramsden eyepiece, the two lenses are made of the same kind of glass, e.g., spectacle crown.
text: In the Ramsden eyepiece, the two lenses are made of the same kind of glass, e.g., spectacle crown.