This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1873 edition. Excerpt: ...the intensity is reduced to one-ninth. Or more generally, if the distances are--1, 2, 3, 4, 5 n, the intensities will be,1111 1 '!' F i? 25'....-181. The velocity of light, according to Eoemer, is 192,500 miles per second; according to Bradley, 191,515 miles. 182. Light is reflected irregularly, or scattered, ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1873 edition. Excerpt: ...the intensity is reduced to one-ninth. Or more generally, if the distances are--1, 2, 3, 4, 5 n, the intensities will be,1111 1 '!' F i? 25'....-181. The velocity of light, according to Eoemer, is 192,500 miles per second; according to Bradley, 191,515 miles. 182. Light is reflected irregularly, or scattered, from, the surface of imperfectly polished bodies. 183. Light is reflected regularly from smooth polished surfaces. Such surfaces, which are sometimes plane and sometimes curved, are called mirrors (miror, to wonder at), or specula (specio, to look). 184. When light is reflected from a polished surface, if it be perpendicular thereto, it is reflected back, along the path whence it came. But if the ray be oblique to the surface, it is reflected obliquely, and the angle of incidence is equal to the angle of reflection, and in the same plane. Fig. 19. Thus if a ray of light D B be incident upon a surface E F, it will be reflected back along the same line; but an oblique ray A B will, after striking the surface, be reflected along the line B C; and the angle A B D will be equal to the angle C B D. 185. In plane mirrors the image of any object re-fleeted, appears to be as far behind the mirror as the object is in front of the mirror. If a line be drawn from the object at right angles to the mirror and be produced, the image will apparently lie upon that line, at the point where a line drawn from the eye of the observer through the point of reflection, intersects it. 186. The reflection of light from curved surfaces follows the law as to the equality of the angle of incidence and of reflection (N. 184). We may imagine any curved surface to be formed by a number of small plane surfaces. In a spherical concave mirror the reflected rays meet at a...
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Add this copy of Notes of a Course of Nineteen Lectures on Natural to cart. $56.29, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2016 by Palala Press.
