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Lessons in Elementary Physics

Lessons in Elementary Physics


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About the Book

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. 1884 Excerpt: ...to measure the intensity of its light. Thus if one light causes the grease spot to vanish when placed at the distance of one foot in front of the screen, and another light when placed at the distance of two feet, we should conclude that the luminosity of the latter is four times' as great as that of the former, inasmuch as the latter is found to produce the same effect as the former at double the distance, and we know that by doubling the distance the effect upon the screen is diminished four times (Art. 255). 259. We again remark the distinction between the illuminating power of a source of light and the inherent brightness or quality of the light. The illuminating power is quantitative merely, and refers to the capacity of the light to illuminate a screen at a given distance. But the intrinsic luminosity takes account of the size of the luminous body as well. For instance, a large fire may produce the same illuminating effect as a couple of jets of gas; but the size of the fire is much larger, and if we place the gas between our eye and the fire we shall soon see that, size for size, the gas will give most light. Lesson XXVIII.--Reflexion Of Light. 260. From Plane Mirrors.--When a ray of light falls upon a plane and polished metallic surface, it is reflected according to the same law which holds for sound (Art. 142); that is to say, the angle of reflexion is equal to the angle of incidence, while both the incident and reflected rays are in a plane perpendicular to the surface of the mirror. The truth of this law may be rendered visible to the eye by allowing a beam from the sun, or from an electric lamp, to fall upon a mirror in an otherwise dark room. The path of the ray, both before and after reflexion, will be rendered sufficiently visible by the float...


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Product Details
  • ISBN-13: 9781151211132
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 142
  • Spine Width: 8 mm
  • Width: 189 mm
  • ISBN-10: 1151211133
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 268 gr


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