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:

    “A primary function of art and thought is to liberate the individual from the tyranny of his culture in the environmental sense and to permit him to stand beyond it in an autonomy of perception and judgment.”
    —Lionel Trilling (1905–1975)

    “There is a small steam engine in his brain which not only sets the cerebral mass in motion, but keeps the owner in hot water.”
    —Unknown. New York Weekly Mirror (July 5, 1845)