A Treatise on Optics

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Carey, Lea, & Blanchard, 1833 - 95 pages
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Page 22 - It may also be defined as the sine of the angle of incidence divided by the sine of the angle of refraction, as light passes from air into the substance.
Page 151 - When the rising sun shines from that point whence its incident ray forms an angle of about 45° on the sea of Reggio, and the bright surface of the water in the bay is not disturbed either by the wind or the current, the spectator being placed on an eminence of the city, with his back to the sun and his face to the sea, on a sudden...
Page 103 - Massinger is one of the most interesting as well as one of the most...
Page 71 - ... parts, the orange 27, the yellow 48, the green 60, the blue 60, the indigo 40, and the violet 80...
Page 74 - ... a grooved structure, like the delicate texture of the skin at the top of an infant's finger, or like the section of the annual growths of wood as seen upon a dressed plank of fir. These may sometimes be seen by the naked eye ; but they are often so minute that 3,000 of them are contained in an inch.
Page 179 - Herschel attributes this state of vision to a defect in the sensorium, by which it is rendered incapable of appreciating exactly those differences between rays on which their colour depends.
Page 151 - ... they could not, at first, be persuaded of the reality of the appearance ; but soon became so thoroughly convinced, by the cliffs gradually appearing more elevated, and approaching nearer, as it were, that they pointed out, and named to...
Page 178 - A new theory of accidental colours is therefore requisite to embrace this class of facts. . " As in acoustics, where every fundamental sound is actually accompanied with its harmonic sound, so in the impressions of...
Page 97 - ... left, or on any other side of it, provided that in all these cases it falls upon the surface in the same manner, or, what amounts to the same thing, the beam of solar light has the same properties on all its sides; and this is true, whether it is white light as directly emitted from the sun, or whether it is red light, or light of any other colour.
Page 175 - With the aid of these facts, the theory of accidental colors will be readily understood. When the eye has been for some time fixed on the red wafer, the part of the retina occupied by the red image is strongly excited, or, as it were, deadened by its continued action.

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