Assertion: newtonian telescope's mirror | /r/HasAspect | parabolic surface
Facets:
value: with three key parameters
type: OTHER
Source sentences:
text: A primary mirror for a Newtonian has a parabolic surface with three key parameters: Mirror Diameter, Focal Length, and Focal Ratio.
text: The main mirror has a parabolic surface and this removes spherical (or color) aberration as it focuses the light rays to a common focus point.