Elementary Treatise on Natural Philosophy, Volumen4D. Appleton, 1891 |
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Página 860
... screen , 973. Caustics , primary and secondary foci , 974. Two focal lines , 975. Virtual images , 976 , 977. Convex mirrors , 978. Cylindric mirrors . Anamor- phosis , 979. Ophthalmoscope and Laryngoscope , 980 , . pp . 967-991 ...
... screen , 973. Caustics , primary and secondary foci , 974. Two focal lines , 975. Virtual images , 976 , 977. Convex mirrors , 978. Cylindric mirrors . Anamor- phosis , 979. Ophthalmoscope and Laryngoscope , 980 , . pp . 967-991 ...
Página 861
... screen is proportional to solid angle subtended by lens . Appearance presented to eye at focus , 1040. Field of view in astronomical telescope , 1041. Cross - wires , and their adjustment for preventing parallax , 1042 . Line of ...
... screen is proportional to solid angle subtended by lens . Appearance presented to eye at focus , 1040. Field of view in astronomical telescope , 1041. Cross - wires , and their adjustment for preventing parallax , 1042 . Line of ...
Página 869
... 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 expansion of the cold lead . When the hot iron comes in contact with it , 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 expansion of the cold lead . When the hot iron comes in contact with it , a ...
Página 927
... screen E ; we can thus , by proper adjustments , form upon the screen a sharp and bright image of the sun , which will appear as a small spot of light . As long as the apparatus remains at rest , we shall not observe any movement of the ...
... screen E ; we can thus , by proper adjustments , form upon the screen a sharp and bright image of the sun , which will appear as a small spot of light . As long as the apparatus remains at rest , we shall not observe any movement of the ...
Página 929
... screen , we may see them by looking into the second mirror , either with a telescope , as in Fig . 633 , Fig . 634. - Lissajous ' Figures , Unison , Octave , and Fifth . or with the naked eye . In this form of the experiment , a lamp ...
... screen , we may see them by looking into the second mirror , either with a telescope , as in Fig . 633 , Fig . 634. - Lissajous ' Figures , Unison , Octave , and Fifth . or with the naked eye . In this form of the experiment , a lamp ...
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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