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 122
ace as of an enormous bulk.This is illustrated by the following figure. Letc n, Fig. 24, represent the surface of a concavemirror, and A a human face looking into it, theface will appear magnified as represented by theimage behind the mirror d q. Suppose a ray a cproceeding from the forehead, and… … B o q , and consequently magnified much beyondthe natural size, and at a small distance behind themirror. If we suppose the side T u to represent a convexmirror, and the figure d q a head of an ordinarysize, then the figure A will represent the dimin-ished appearance which a persons face…
Astronomy · Astronomical instruments · Telescopes
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