Assertion: telescope's objective | /r/HasProperty | lens
Facets:
value: in a telescope
type: LOCATION
Source sentences:
text: The main objective in a reflecting telescope is a mirror whereas the main objective in a refracting telescope is a lens.
text: In a telescope the objective is the lens at the front end of a refracting telescope (such as binoculars or telescopic sights) or the image-forming primary mirror of a reflecting or catadioptric telescope.