Lockyer, Norman, Sir, 1836-1920, Seabroke, G. M. (George Mitchell), 1848-1918 · London, Macmillan and co. · leaf 119
be at s, and these two pointsare therefore called conjugate foci. If a candle is held at a short distance in front ofa concave mirror, as represented in Fig. 51, its imageappears on the paper between the candle and the mirror,so that the rays from every point of the flame arebrought to a focus, and… … Fio. 52.—Diagram explaining Fig. 51. pass through the centre of curvature of the mirror c,will fall perpendicularly on the surface, and be reflectedback on themselves, so that the focus of the part A of thearrow will be somewhere on A a, and that of B on B h, andby drawing another ray we shall find…
Astronomy · Telescopes
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