Assertion: newtonian telescope's mirror | /r/HasAspect | hole
Facets:
value: in it
type: LOCATION
value: in the gregorian
type: TEMPORAL
value: in this arrangement
type: OTHER
value: in the middle
type: LOCATION
Source sentences:
text: However, the primary mirror has a hole in it, and convex secondary mirror has a flat position to the primary.
text: Finally, the primary mirror has no hole, so the focuser of a Mak-Newt is positioned as it is on the traditional Newtonian.
text: In this arrangement, the light-gathering concave mirror has a hole in the middle (\(\PageIndex{7b}\)).
text: In the Gregorian the primary mirror has to have a hole in the center of it which is also an additional challenge.