A primary mirror (or primary) is the principal light-gathering surface (the objective) of a reflecting telescope. == Description == The primary mirror of a reflecting telescope is a spherical, parabolic, or hyperbolic shaped disks of polished reflective metal (speculum metal up to the mid 19th century), or in later telescopes, glass or other material coated with a reflective layer.
A primary mirror (or primary) is the principal light-gathering surface (the objective) of a reflecting telescope. == Description == The primary mirror of a reflecting telescope is a spherical, parabolic, or hyperbolic shaped disks of polished reflective metal (speculum metal up to the mid 19th century), or in later telescopes, glass or other material coated with a reflective layer.
Source: Wikipedia "Primary mirror" · CC BY-SA 4.0
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