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 114
ing upon it.These rays, when they strike the mirror, are madeto diverge in the direction AG, BH, &c. and boththe parallel and divergent rays are here representedas they appear in a dark chamber, when a convexmirror is presented to the solar rays. The dottedlines denote only the course or… … PARALLEL RAYS The following are some of the properties ofconvex mirrors : 1. The image appears alwayserect, and behind the reflecting surface. 2. Theimage is always smaller than the object, and thediminution is greater in proportion as the object isfurther from the mirror, but if the object…
Astronomy · Astronomical instruments · Telescopes
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