Elementary treatise on physics, experimental and applied : for the use of colleges and schools (1906)
Ganot, A. (Adolphe), 1804-1887, Atkinson, Edmund, 1831-1901, Reinold, A. W. (Arnold William), 1843-1921 · New York : Wood · leaf 566
548 On Lis^ht [539- by the method of conjugate foci. For this purpose we require only, besidesthe mirror, a luminous object and a screen. The former maybe a candle orgas flame, or, better, black lines ruled on thin ground glass and illuminated … by a gas flame. The screen is a small disc of ground glass. If infig. 506 the mirror is arranged with its principal axis horizontal, and thecandle is placed some distance away, as AB, but symmetrically with regardto the axis, its image will be formed at ab^ and the screen must be moved until this…
Physics
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