Light: A Series of Simple, Entertaining, and Inexpensive Experiments in the Phenomena of Light, for the Use of Students of Every AgeD. Appleton, 1877 - 112 páginas |
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Página 32
... distance increases . A is the lamp , and B is the postal - card , having a slit for the light to pass . C is the paper screen , and D is the first shadow made on the screen when it was 24 inches from the lamp . E is the second shadow ...
... distance increases . A is the lamp , and B is the postal - card , having a slit for the light to pass . C is the paper screen , and D is the first shadow made on the screen when it was 24 inches from the lamp . E is the second shadow ...
Página 34
... distance the light has a certain bright- ness ; at half that distance it has four times the brightness ; at one - third the distance it has nine times as much brightness . The above relation , existing between the intensity of the light ...
... distance the light has a certain bright- ness ; at half that distance it has four times the brightness ; at one - third the distance it has nine times as much brightness . The above relation , existing between the intensity of the light ...
Página 36
... distance . Perhaps the candle is 22 inches ( 55.8 centimetres ) from the the screen , and the lamp is 44 inches ( 112 centi- metres ) . In our last experiment we found that the illu- mination of a given surface varies inversely as the ...
... distance . Perhaps the candle is 22 inches ( 55.8 centimetres ) from the the screen , and the lamp is 44 inches ( 112 centi- metres ) . In our last experiment we found that the illu- mination of a given surface varies inversely as the ...
Página 37
... distance of the can- dle will divide the square of the distance of the lamp four times . If we measure it another way we find the candle is half the distance from the lamp to the screen , and gives only one - quarter as much light ...
... distance of the can- dle will divide the square of the distance of the lamp four times . If we measure it another way we find the candle is half the distance from the lamp to the screen , and gives only one - quarter as much light ...
Página 64
... distances with those we obtained the first time . Di- vide the distance between A and B by the distance between C and D , and you will obtain a certain quo- tient . Divide the two sets of figures obtained the second time ( that is , the ...
... distances with those we obtained the first time . Di- vide the distance between A and B by the distance between C and D , and you will obtain a certain quo- tient . Divide the two sets of figures obtained the second time ( that is , the ...
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Términos y frases comunes
15.2 centimetres 551 BROADWAY ALEXANDER BAIN ALFRED MARSHALL angle angle of incidence appear beam of light beam of reflection beam of sunlight beautiful black mirror block of wood blue bright candle centi centre CHARLES BARNARD color color-top curious dark room diameter disk distance dotted lines experiment fastened flask focus FRANCIS GALTON give glass gray paper green heliostat hole Illustrations inch 25 millimetres inches 12.7 centimetres lamp lantern light entering light passes look looking-glass M. A. Cloth magic lanterns ments metres mirror mucilage phenomena picture piece plano-convex lens point of incidence postal-card Price Prof Professor rays red square reflected light refraction ring SCIENCE screen shade shadow sheet shine side slide slit smoke spot of light square stars surface things top spin tube University of Erlangen violet wall water-lens window yellow