Handbook of optics for students of ophthalmology (1899)
Souter, William Norwood, 1961-1935 · New York, Macmillan · leaf 190
nemirror. Figure 49 illustrates reflexion by the concavemirror; light from A is focused at A!. If A rep- 180 HANDBOOK OF OPTICS resent a gas flame, an image of this flame will beformed at A. Continuing the study of reflexion at a sphericalsurface, we see that if we make / equal to infinity, f is… … Fig. 49. tween the centre of curvature and the surface of themirror. If the mirror is convex, - is positive, and the principal focus lies behind the mirror. Clearlysuch a focus must be virtual, while the negativefocus of the concave mirror is real. Hence if weuse equation (a), real foci in…
Eye · Lenses
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