The New Encyclopaedia Britannica, Volume 29Encyclopaedia Britannica, 1974 - Encyclopedias and dictionaries |
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Page 247
... light and X - rays . The sun's rays are rich in such light , sometimes referred to as black light because it is not visible to the naked eye . The ultraviolet lamp usually con- sists of an electric discharge lamp with materi- al that ...
... light and X - rays . The sun's rays are rich in such light , sometimes referred to as black light because it is not visible to the naked eye . The ultraviolet lamp usually con- sists of an electric discharge lamp with materi- al that ...
Page 461
... light coming from the direction of the object to the observer and the light reaching the observer from the background surrounding the object . In the atmosphere , visibility is governed prin- cipally by the amount of light scattered by ...
... light coming from the direction of the object to the observer and the light reaching the observer from the background surrounding the object . In the atmosphere , visibility is governed prin- cipally by the amount of light scattered by ...
Page 584
... light and hence reduce its size . Frequency di- vided by the speed of light is v / c , which from the above equation is 1 / λ . When wavelength is measured in metres , 1 / A represents the number of waves of the wave train to be found ...
... light and hence reduce its size . Frequency di- vided by the speed of light is v / c , which from the above equation is 1 / λ . When wavelength is measured in metres , 1 / A represents the number of waves of the wave train to be found ...
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