Assertion: newtonian telescope's mirror | /r/HasProperty | easier to make
Facets:
value: in fast focal ratios
type: OTHER
value: much
type: DEGREE
Source sentences:
text: Instead of a paraboloidal primary mirror, the SN uses a spherical mirror which is much easier to make, especially in fast focal ratios.
text: Mirrors are easier to make than lenses, so within any particular price range reflectors tend to be larger.