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 fact is a proposition of which the verification by an appeal to the primary sources of our knowledge or to experience is direct and simple. A theory, on the other hand, if true, has all the characteristics of a fact except that its verification is possible only by indirect, remote, and difficult means.”
—Chauncey Wright (1830–1875)
“The good enough mother, owing to her deep empathy with her infant, reflects in her face his feelings; this is why he sees himself in her face as if in a mirror and finds himself as he sees himself in her. The not good enough mother fails to reflect the infant’s feelings in her face because she is too preoccupied with her own concerns, such as her worries over whether she is doing right by her child, her anxiety that she might fail him.”
—Bruno Bettelheim (20th century)