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
... square and the lamp , and about 24 inches ( 61 centimetres ) from the lamp . If everything is right , there will be a square shadow of the bit of paper on the screen . Look carefully at everything , and have the paper just on a level ...
... square and the lamp , and about 24 inches ( 61 centimetres ) from the lamp . If everything is right , there will be a square shadow of the bit of paper on the screen . Look carefully at everything , and have the paper just on a level ...
Página 33
... square C is illuminated . Remove the square C , and D will be lighted , which shows that all the light that falls on D previously fell THE SOURCES OF LIGHT . 3333.
... square C is illuminated . Remove the square C , and D will be lighted , which shows that all the light that falls on D previously fell THE SOURCES OF LIGHT . 3333.
Página 34
... square C , and any one of the squares on E is one - ninth as bright as C. Here we are coming upon another fact about light ; we find another law governing its action . At one foot from the lamp the light had a certain power ; at two ...
... square C , and any one of the squares on E is one - ninth as bright as C. Here we are coming upon another fact about light ; we find another law governing its action . At one foot from the lamp the light had a certain power ; at two ...
Página 36
... square of its distance from the source of light . The square of 22 is 484 , and the square of 44 is 1,938 . Now , if we divide 1,938 by 484 , we get 4 , and thus we find that our lamp is four times as bright 36 LIGHT .
... square of its distance from the source of light . The square of 22 is 484 , and the square of 44 is 1,938 . Now , if we divide 1,938 by 484 , we get 4 , and thus we find that our lamp is four times as bright 36 LIGHT .
Página 37
... square of the 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 ...
... square of the 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 ...
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Términos y frases comunes
17.8 centimetres angle of incidence Animals appear beam of light beam of reflection beam of sunlight beautiful black mirror block of wood blue BOND STREET bright candle centi centre CHARLES BARNARD circle cloth color color-top critical angle curious dark room diagram diameter direction disk distance dotted lines experiment falls fastened flask focus give glass gray paper heliostat hold hole Illustrations inch 25 millimetres inches 15.2 centimetres index of refraction lamp lantern light entering light passes look looking-glass magic lanterns metres mirror mucilage phenomena picture piece plano-convex lens point of incidence postal-card rays red square reflected light refraction represents ring screen shade shadow sheet shelf shine side slender beam slide slip slit smoke spot of light square stars straight surface things top spin tube wall water-lens wide window yellow
Pasajes populares
Página 3 - ... recommendation of this handy volume. The illustrations add to its interest and value, and its simplicity, both of design and execution, will commend it to beginners and others seeking information on the subject." From the Philadelphia Press. "It supplies a large number of simple and entertaining experiments on the phenomena of light, that any one can perform with materials that maybe found in any dwelling-house, or that maybe bought for a small sum in any town or city. This actually is philosophy...