Elementary treatise on physics experimental and applied for the use of colleges and schools (1890)
Ganot, A. (Adolphe), 1804-1887, Atkinson, E. (Edmund) · New York : W. Wood · leaf 510
e shadows, it follows, fromthe first law of the intensity of light, that the intensity of the lamp at the distance d is -- and that of the candle —-; at the distance d. On the screend- d- these two intensities are equal ; hence -r; = 7-; or ~ =-^^j ^vhich was to be d-d- I d- proved. Biinsens… … Fie. 448. if, on the contrary, it be illuminated from behind, the spot appears light ona dark ground. If the greased part and the rest appear unchanged, theintensity of illumination on both sides is the same. Bunsens photometerdepends on an application of this principle. Its essential features are…
Physics
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