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 33
... surface , and that the shadow is four times as large . Place it on the larger shadow E , and you will see that it covers only one - ninth of its sur- face . In the diagram the first shadow is marked off into quarters , and the second ...
... surface , and that the shadow is four times as large . Place it on the larger shadow E , and you will see that it covers only one - ninth of its sur- face . In the diagram the first shadow is marked off into quarters , and the second ...
Página 34
... surface at the distance D , and nine times the surface at the distance E. Hence each one of the squares on D is one - fourth as bright as the square C , and any one of the squares on E is one - ninth as bright as C. Here we are coming ...
... surface at the distance D , and nine times the surface at the distance E. Hence each one of the squares on D is one - fourth as bright as the square C , and any one of the squares on E is one - ninth as bright as C. Here we are coming ...
Página 36
... surface varies inversely as the 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 ...
... surface varies inversely as the 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 ...
Página 45
... surface of the quick- silver at the back of the glass , and the space between the reflection and the pencil is filled by the glass . Hold a sheet of common window - glass before a lighted lamp or candle , and you will see a faint re ...
... surface of the quick- silver at the back of the glass , and the space between the reflection and the pencil is filled by the glass . Hold a sheet of common window - glass before a lighted lamp or candle , and you will see a faint re ...
Página 46
... surface , and is turned back against the quicksilver again . Once more it is reflected , and a new beam of reflection makes number 3. The drawing shows the path these beams of light take in the glass , and the quivering spots of light ...
... surface , and is turned back against the quicksilver again . Once more it is reflected , and a new beam of reflection makes number 3. The drawing shows the path these beams of light take in the glass , and the quivering spots of light ...
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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