Assertion: reflecting telescope's mirror | /r/HasProperty | parabolic
Facets:
Source sentences:
text: Most reflectors have built-in parabolic mirrors, as they are much more cost-effective.
text: The mirror is parabolic, thus resulting in perfect undistorted images of even far off objects.
text: The primary mirror is parabolic while the secondary mirror is hyperbolic.
text: James Gregory, in his 1663 book Optica Promota (1663), pointed out that a reflecting telescope with a mirror that was parabolic would correct spherical aberration as well as the chromatic aberration seen in refracting telescopes.
text: To allow reflectors to have low focal ratios of around F5 they use a parabolic mirror.