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absorbed angle appear axes axis beam becomes blue bodies bright called centre circle colors combined common concave convex crystals described diameter direction distance diverging double refraction effect equal exhibit experiments explain extreme faces fall figure focal length focus fringes give given glass greater green heat Hence inch incident inclination increased lens lenses less light look magnifying manner means mirror nearly negative object observed opposite orange ordinary parallel particles passing pencil perpendicular phenomena placed plane plate polarized polarized light portion position principal prism produced rays reflected reflexion retina rhomb rings round seen shown in fig side single space spar spectrum spherical suppose surface Table telescope thickness thin tint tion transmitted turned violet vision white light yellow
Page 34 - 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 217 - 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 95 - ... parts, the orange 27, the yellow 48, the green 60, the blue 60, the indigo 40, and the violet 80...
Page 68 - ... very little of the violet. The yellow space, which has not been much absorbed, has increased in breadth. It occupies part of the space formerly covered by the orange on one side, and part of the space formerly covered by the green on the other. Hence it follows, that the blue glass has absorbed...
Page 104 - ... 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 219 - French coast, which is about 40 or 50 miles distant, as distinctly as through the best glasses. The sailors and fishermen could not at first be persuaded of the reality of the appearance; but as the cliffs gradually appeared more elevated, they were so convinced that they pointed out and named to Mr. Latham the different places which they had been accustomed to visit : such as the bay, the windmill at Boulogne, St.
Page 248 - 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 137 - ... 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.