The Spectroscope: Its Uses in General Analytical Chemistry (Classic Reprint) - Hardcover

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Excerpt from The Spectroscope: Its Uses in General Analytical Chemistry

Colour Refraction and dispersion Absorption The spectrum, prismatic and diffraction - Nature of spectra - Principles of the spectroscope.

White light, as 'daylight' and. Most Ordinary sources of artificial light are called, is in reality a composition. A beam of white light can be split up into a number Of beams of coloured light, and these, if recombined, would once again produce the sensation Of white light. Light is caused by electro-magnetic vibrations of the ether, which travel in the form of waves, meet the eye, and stimulate the Optic nerves. According to the young-helmholtz theory of colour, three primary colour sensations exist, and the eye possesses three sets of nerves, which, when excited, give the sensations of red, green, and violet respectively. The sensation of white can be produced either when rays of light of three selected frequencies enter the eye, or when rays of a very great number of frequencies, to be considered later, enter the eye. The sensations of various colours are produced by the three sets of nerves being stimulated, singly or together, to different degrees.

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