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:

    “One of the effects of a safe and civilised life is an immense oversensitiveness which makes all the primary emotions somewhat disgusting. Generosity is as painful as meanness, gratitude as hateful as ingratitude.”
    —George Orwell (1903–1950)

    “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)