Assertion: telescope's aberration | /r/HasProperty | spherical
Facets:
Source sentences:
text: James Gregory went into further detail in his book Optica Promota (1663), pointing out that a reflecting telescope with a mirror that was shaped like the part of a conic section, would correct spherical aberration as well as the chromatic aberration seen in refractors.
text: It used a primary mirror at the back of the telescope with a glass corrector plate in the front of the telescope, which was designed to remove spherical aberration.