Assertion: newtonian telescope's mirror | /r/HasProperty | concave primary
Facets:
Source sentences:
text: The Newtonian telescope is a type of reflecting telescope invented by the British scientist Sir Isaac Newton, using a concave primary mirror and a flat diagonal secondary mirror.
text: The Newtonian telescope is a type of reflecting telescope invented by the British scientist Sir Isaac Newton, using a concave primary mirror and a flat diagonal secondary mirror.
text: The Newtonian telescope is a type of reflecting telescope invented by the British scientist Sir Isaac Newton using a concave primary mirror and a flat diagonal secondary mirror.