Assertion: reflecting telescope's mirror | /r/HasProperty | parabolic reflector
Facets:
value: under the first approximation
type: OTHER
Source sentences:
text: The mathematical treatment is done under the paraxial approximation, meaning that under the first approximation a spherical mirror is a parabolic reflector.
text: Parabolic mirrors may also be referred to as parabolic dishes or parabolic reflectors.