Assertion: newtonian telescope's mirror | /r/CapableOf | reflect the image
Facets:
value: back through a hole
type: TRANSITIVE-OBJECT
Source sentences:
text: The Gregorian telescope, described by Scottish astronomer and mathematician James Gregory in his 1663 book Optica Promota, employs a concave secondary mirror that reflects the image back through a hole in the primary mirror.
text: Bourne's is the best description of it, and from his writing it seemed to consist of peering into a large curved mirror that reflected the image produced by a large lens.
text: The reflector type (also called a reflecting telescope) uses mirrors, which have a glossy surface to gather light and then reflect the image.