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:

    “But the doctrine of the Farm is merely this, that every man ought to stand in primary relations to the work of the world, ought to do it himself, and not to suffer the accident of his having a purse in his pocket, or his having been bred to some dishonorable and injurious craft, to sever him from those duties.”
    —Ralph Waldo Emerson (1803–1882)

    “Out flew the web and floated wide;
    The mirror cracked from side to side;
    ‘The curse is come upon me,’ cried
    The Lady of Shalott.”
    —Alfred Tennyson (1809–1892)