Elementary Treatise on Natural Philosophy, Volumen4D. Appleton, 1891 |
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Página 869
... beam of 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 ...
... beam of 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 ...
Página 872
... beam , are distinctly heard by a person with his ear applied to the other end , though they cannot be heard at the same distance through the air . This property is sometimes employed as a test of the soundness of a beam , for the ...
... beam , are distinctly heard by a person with his ear applied to the other end , though they cannot be heard at the same distance through the air . This property is sometimes employed as a test of the soundness of a beam , for the ...
Página 927
... beam of solar rays , which , after passing through a lens L , is reflected , first , from a small mirror fixed on one of the branches of a tuning - fork D , and then from a second mirror M , which throws it on a screen E ; we can thus ...
... beam of solar rays , which , after passing through a lens L , is reflected , first , from a small mirror fixed on one of the branches of a tuning - fork D , and then from a second mirror M , which throws it on a screen E ; we can thus ...
Página 931
... beam of light upon it through the lens c . When the forks are set vibrating , the bright point is seen as a luminous ellipse , whose permanence of form is a test of the closeness of the unison . The ellipse will go through a complete ...
... beam of light upon it through the lens c . When the forks are set vibrating , the bright point is seen as a luminous ellipse , whose permanence of form is a test of the closeness of the unison . The ellipse will go through a complete ...
Página 949
... beam will be illuminated . The experiment is easily performed in a dark room , by admitting sunlight through an exceedingly fine slit , and receiving it on a screen of white paper . The illuminated area will be marked with coloured ...
... beam will be illuminated . The experiment is easily performed in a dark room , by admitting sunlight through an exceedingly fine slit , and receiving it on a screen of white paper . The illuminated area will be marked with coloured ...
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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