Encyclopedia Americana, Količina 19Americana Corporation, 1965 |
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Zadetki 1–3 od 79
Stran 17
... light in a vacuum . Shortly afterwards he de- veloped his interferometer ( q.v. ) , which estab- lished the wave length of light as a practical unit of measure . At Sèvres , France , in 1892 , he measured the standard meter , expressing ...
... light in a vacuum . Shortly afterwards he de- veloped his interferometer ( q.v. ) , which estab- lished the wave length of light as a practical unit of measure . At Sèvres , France , in 1892 , he measured the standard meter , expressing ...
Stran 19
... light microscope images are formed in visible light by lenses constructed usually of glass . The visible light portion of the electromagnetic spectrum , measured in angstrom units ( A ) , extends from a wavelength of about 4000 A to one ...
... light microscope images are formed in visible light by lenses constructed usually of glass . The visible light portion of the electromagnetic spectrum , measured in angstrom units ( A ) , extends from a wavelength of about 4000 A to one ...
Stran 20
... light on the object and , with high powers especially , to provide strongly convergent light so that the full resolving power of the objective lens may be realized . The stand of the conventional compound micro- scope ( Fig . 2 ) serves ...
... light on the object and , with high powers especially , to provide strongly convergent light so that the full resolving power of the objective lens may be realized . The stand of the conventional compound micro- scope ( Fig . 2 ) serves ...
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