Primary Mirror

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

Read more about Primary Mirror:  Description, Superlative Primary Mirrors

Famous quotes containing the words primary and/or mirror:

    “The primary distinction of the artist is that he must actively cultivate that state which most men, necessarily, must avoid: the state of being alone.”
    —James Baldwin (1924–1987)

    “At first, it must be remembered, that [women] can never accomplish anything until they put womanhood ahead of wifehood, and make motherhood the highest office on the social scale.”
    —“Jennie June” Croly 1829–1901, U.S. founder of the woman’s club movement, journalist, author, editor. Demorest’s Illustrated Monthly and Mirror of Fashions, pp. 24-5 (January 1870)