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:

    “Parental attitudes have greater correlation with pupil achievement than material home circumstances or variations in school and classroom organization, instructional materials, and particular teaching practices.”
    —Children and Their Primary Schools, vol. 1, ch. 3, Central Advisory Council for Education, London (1967)

    “Customs and convictions change; respectable people are the last to know, or to admit, the change, and the ones most offended by fresh reflections of the facts in the mirror of art.”
    —John Updike (b. 1932)