The practical astronomer : comprising illustrations of light and colours, practical descriptions of all kinds of telescopes, the use of the equatorial-transit, circular, and other astronomical instruments, a particular account of the Earl of Rosse's large telescopes, and other topics connected with astronomy (1845)
Dick, Thomas, 1774-1857 · London : Seeley, Burnside, and Seeley · leaf 96
rays oflight from any object are refracted through a con-vex lens, they paint a distinct and accurate pictureof the object before it, in all its colours, shades,and proportions. Previous to experience, we couldhave had no conception that light, when passingthrough such substances, and converging to… … B Let L, N, represent a double convex lens, A, C, 72 THE PRACTICAL ASTRONOMER. a, its axis, and OB, an object perpendicular to it.A ray passing from the extremity of the object at O,after being refracted by the lens at F, will pass onin the direction EI, and form an image of thatpart of the object…
Astronomy · Astronomical instruments · Telescopes
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