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:

    “If a madman were to come into this room with a stick in his hand, no doubt we should pity the state of his mind; but our primary consideration would be to take care of ourselves. We should knock him down first, and pity him afterwards.”
    —Samuel Johnson (1709–1784)

    “A man has only one escape from his old self: to see a different self—in the mirror of some woman’s eyes.”
    —Clare Boothe Luce (1903–1987)