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1967
It is known, these days, that electromagnetic radiation exists at just about every conceivable wavelength. The velocity of this radiation, in empty space, has a fixed value, roughly 3 × 108 m sec-1, regardless of the wavelength. The longer wavelengths are generated by electrical circuits and are used for radio.
J. S. Marshall +2 more
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It is known, these days, that electromagnetic radiation exists at just about every conceivable wavelength. The velocity of this radiation, in empty space, has a fixed value, roughly 3 × 108 m sec-1, regardless of the wavelength. The longer wavelengths are generated by electrical circuits and are used for radio.
J. S. Marshall +2 more
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1972
Man's ability to discriminate colors increases both his enjoyment and appreciation of the world around him. Because color is such a significant factor in the appearance of an object, it is an important characteristic of any paint. Appearance is one quality of a product that every customer can judge for himself.
HK Hammond, TJ Keane
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Man's ability to discriminate colors increases both his enjoyment and appreciation of the world around him. Because color is such a significant factor in the appearance of an object, it is an important characteristic of any paint. Appearance is one quality of a product that every customer can judge for himself.
HK Hammond, TJ Keane
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1981
Color can be seen only if there is light. Unlike the absolute sense of musical pitch, possessed by some persons, there is no absolute sense of color. All color perception is relative. For wide ranges of variation of spectral distributions and of location in the chromaticity diagram of the point that represents it, any light source looks white, as do ...
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Color can be seen only if there is light. Unlike the absolute sense of musical pitch, possessed by some persons, there is no absolute sense of color. All color perception is relative. For wide ranges of variation of spectral distributions and of location in the chromaticity diagram of the point that represents it, any light source looks white, as do ...
openaire +1 more source
2011
In ancient times it was believed that the eye radiated a cone of visual flux which mixed with visible objects in the world to create a sensation in the observer – like the sense of touch, but at a distance – this is the extromission theory. Today we consider that light from an illuminant falls on the scene, some of which is reflected into the eye of ...
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In ancient times it was believed that the eye radiated a cone of visual flux which mixed with visible objects in the world to create a sensation in the observer – like the sense of touch, but at a distance – this is the extromission theory. Today we consider that light from an illuminant falls on the scene, some of which is reflected into the eye of ...
openaire +1 more source