Elementary Treatise on Natural Philosophy, Volumen4D. Appleton, 1891 |
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Página 860
... LIGHT . Light . Hypothesis of æther , 936. Excessive frequency of vibration . Sharpness of shadows due to shortness of waves , 937. Images produced by small apertures , 938 . Shadows . Umbra and penumbra , 939. Velocity of light , 940 ...
... LIGHT . Light . Hypothesis of æther , 936. Excessive frequency of vibration . Sharpness of shadows due to shortness of waves , 937. Images produced by small apertures , 938 . Shadows . Umbra and penumbra , 939. Velocity of light , 940 ...
Página 861
... Light received from a star increases with power of eye - piece till magnifying power is 1039. Illumination of image on screen is proportional to solid angle subtended by lens . Appearance presented to eye at focus , 1040. Field of view ...
... Light received from a star increases with power of eye - piece till magnifying power is 1039. Illumination of image on screen is proportional to solid angle subtended by lens . Appearance presented to eye at focus , 1040. Field of view ...
Página 862
... LIGHT . Explanation of rectilinear propagation . Two wave - surfaces in non - isotropic Principle of Huygens . Wave - front , 1079 . Spherical wave - surface in isotropic medium . medium , 1080. Construction for wave - front in ...
... LIGHT . Explanation of rectilinear propagation . Two wave - surfaces in non - isotropic Principle of Huygens . Wave - front , 1079 . Spherical wave - surface in isotropic medium . medium , 1080. Construction for wave - front in ...
Página 869
... light is directed . The reflected light can be made to form an image upon a screen , and this image is seen to be in a state of oscillation as long as the sound is heard . The movements observed in this experiment are due to the sudden ...
... light is directed . The reflected light can be made to form an image upon a screen , and this image is seen to be in a state of oscillation as long as the sound is heard . The movements observed in this experiment are due to the sudden ...
Página 887
... light , is capable of being refracted . A spherical balloon of collodion , filled with carbonic acid gas , acts as a sound - lens . If a watch be hung at some distance from it on one side , an ear held at the conjugate focus on the ...
... light , is capable of being refracted . A spherical balloon of collodion , filled with carbonic acid gas , acts as a sound - lens . If a watch be hung at some distance from it on one side , an ear held at the conjugate focus on the ...
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Términos y frases comunes
achromatic analyser angle of incidence beam body bright lines called centimetres centre coincidence colours concave mirror conjugate foci convex convex lens crystal curvature denote diameter direction distance employed equal experiment eye-piece flame focal length frequency of vibration fundamental note glass harmonics Hence Iceland-spar incident ray index of refraction interval inverted law of sines lens lenses luminous point magnifying power medium metres minimum deviation nearly node normal number of vibrations object object-glass oblique observer obtained octave optical ordinary parallel particles pencil perpendicular pipe pitch placed plane mirror plate polarization portion position principal axis principal focus prism produced propagation radius rarefaction ratio reflected rays refrangibility represented retina rotation screen seen side slit solar spectra spectrum spherical string subtends surface telescope tion tone traversing tube undulation velocity of sound vertical vibrations vibrations per second violet virtual image visual angle wave-front wave-length waves