Elementary Treatise on Natural Philosophy, Volumen4D. Appleton, 1891 |
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Página 861
... 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 in ...
... 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 in ...
Página 865
... received through the rest of our senses , and admitting of great variety in its modifications . The at- tempt to explain the physiological ac- tions which constitute hearing forms no part of our present design . The business of physics ...
... received through the rest of our senses , and admitting of great variety in its modifications . The at- tempt to explain the physiological ac- tions which constitute hearing forms no part of our present design . The business of physics ...
Página 896
... received by an ear placed at the point . The word loud is also frequently applied to a source of sound , as when we say a loud voice , the reference being to the loudness as heard at a given distance from the source . The diminution of ...
... received by an ear placed at the point . The word loud is also frequently applied to a source of sound , as when we say a loud voice , the reference being to the loudness as heard at a given distance from the source . The diminution of ...
Página 949
... receiving it on a screen of white paper . The illuminated area will be marked with coloured bands , called diffraction - fringes ; and if the slit is made narrower , these bands become wider . On the other hand , Colladon , in his ...
... receiving it on a screen of white paper . The illuminated area will be marked with coloured bands , called diffraction - fringes ; and if the slit is made narrower , these bands become wider . On the other hand , Colladon , in his ...
Página 954
... received upon a screen , it will not have sharply defined edges , but will show a gradual transition from the total shadow which covers a finite central area to a complete absence of shadow at the outer boundary of the penumbra . Thus ...
... received upon a screen , it will not have sharply defined edges , but will show a gradual transition from the total shadow which covers a finite central area to a complete absence of shadow at the outer boundary of the penumbra . Thus ...
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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