Elementary Treatise on Natural Philosophy, Volumen4D. Appleton, 1891 |
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Página 861
... distance , 1024. Stereoscope , 1025. Visual angle ; Magnifying power , 1026. Spectacles , 1027. Magnification by a ... distances . Image formed by theoretically perfect lens has same intrinsic brightness as object ; but effective ...
... distance , 1024. Stereoscope , 1025. Visual angle ; Magnifying power , 1026. Spectacles , 1027. Magnification by a ... distances . Image formed by theoretically perfect lens has same intrinsic brightness as object ; but effective ...
Página 865
... distance on the other side ; and it thus swings alternately from one side to the other through distances very gradually diminishing , until at last it comes to rest . Such movement is called vibratory . The motion from D ' to D " , or ...
... distance on the other side ; and it thus swings alternately from one side to the other through distances very gradually diminishing , until at last it comes to rest . Such movement is called vibratory . The motion from D ' to D " , or ...
Página 874
... distance that the pulse has travelled while the vibrating plate was moving from its most backward to its most advanced position , and back again . During this time , which is called the period of the vibrations , each particle of air ...
... distance that the pulse has travelled while the vibrating plate was moving from its most backward to its most advanced position , and back again . During this time , which is called the period of the vibrations , each particle of air ...
Página 876
... distance between A and a remains invariable , being always a wave - length , and these two particles always agree in phase . Any other two particles represented in the diagram are always in different phases , and the phases of A and D ...
... distance between A and a remains invariable , being always a wave - length , and these two particles always agree in phase . Any other two particles represented in the diagram are always in different phases , and the phases of A and D ...
Página 877
... distance is increased . Fig . 606 represents a diametral section of a series of spherical waves . Their mode of propagation has some analogy to that of the circular A B C D E F G H H H A B C D E F G H a 1 J K L 1 J K L a K L a K L a a ...
... distance is increased . Fig . 606 represents a diametral section of a series of spherical waves . Their mode of propagation has some analogy to that of the circular A B C D E F G H H H A B C D E F G H a 1 J K L 1 J K L a K L a K L a a ...
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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