Primary mirror

Rarity: Common

The most frequent rarity: most Wikipedia articles become Commons.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

At a glance

Class

Notion

Domain

Science and technology

In collections

Nobody has pulled it yet.

What Wikipedia says

A primary mirror (or primary) is the principal light-gathering surface (the objective) of a reflecting telescope.

Excerpt from the Wikipedia article “Primary mirror”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Geremia at Italian Wikipedia, Public domain, via Wikimedia Commons.