A Text-Book of Human Physiology;
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Since the action of light on the percipient parts of the retina is in all probability a chemical process in which certain com- pounds are broken down, there would be in the retina, according to this theory, three different visual substances corresponding to the three primary colors. In order not to commit ourselves as to the way in which the light acts directly, we shall designate these percipient elements in general as com- ponents of the visual organ.
Light acts with varying intensity accordi...ng to its wave lengths, on the three components. The red-perceiving component is excited most powerfully by light of the greatest wave length; the green-perceiving component by light of medium wave length, and the violet-perceiving by light of the shortest wave length. However, it is possible, and for the explanation of certain phe- nomena it is necessary, to assume that each spectral color stimulates all the components, one of them feebly, the others powerfully.
SENSATIONS OF COLOR 545 In Fig. 237 the three curves represent schematically, according to Helm- holtz, the relative degree to which each component is stimulated by the different light rays in the production of their appropriate color sensations, thus: Simple red stimulates the red-perceiving component strongly, the other two feebly; sensations of red.
What to read after A Text-Book of Human Physiology;?
You can find similar books in the "Read Also" column, or choose other free books by Tigerstedt, Robert Adolf Armand, 1853-1923 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Since the action of light on the percipient parts of the retina is in all probability a chemical process in which certain com- pounds are broken down, there would be in the retina, according to this theory, three different visual substances corresponding to the three primary colors. In order not to commit ourselves as to the way in which the light acts directly, we shall designate these percipient elements in general as com- ponents of the visual organ.
Light acts with varying intensity accordi...ng to its wave lengths, on the three components. The red-perceiving component is excited most powerfully by light of the greatest wave length; the green-perceiving component by light of medium wave length, and the violet-perceiving by light of the shortest wave length. However, it is possible, and for the explanation of certain phe- nomena it is necessary, to assume that each spectral color stimulates all the components, one of them feebly, the others powerfully.
SENSATIONS OF COLOR 545 In Fig. 237 the three curves represent schematically, according to Helm- holtz, the relative degree to which each component is stimulated by the different light rays in the production of their appropriate color sensations, thus: Simple red stimulates the red-perceiving component strongly, the other two feebly; sensations of red.
What to read after A Text-Book of Human Physiology;?
You can find similar books in the "Read Also" column, or choose other free books by Tigerstedt, Robert Adolf Armand, 1853-1923 to read onlineMoreLess
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