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Home > Art, Film & Photography > Elementary Lessons in Heat, Light & Sound
Elementary Lessons in Heat, Light & Sound

Elementary Lessons in Heat, Light & Sound


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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. 1891 Excerpt: ... water and incident upon the surface at C. Let IN be drawn perpendicular to the surface, and let CR be the direction of the refracted ray in air, as found by the construction given in Art. 47. Produce RC backwards to meet IN at R.' The triangles CNR' and CN'R are similar: for the opposite angles at C are equal, and the angles at N and N' are right angles. Hence the sides about the equal angles at C are proportional. Now CN =--CN'. 4 This gives us another construction for finding the path of the refracted ray. Let IC be the incident ray. Draw IN perpendicular to the surface of separation. Divide CI into four equal parts. Along IN find a point R' such that CR' is equal to three of these parts. Join R'C and produce it: this is the path of the refracted ray in air. We shall use this construction in the next article. 53. Image pf Point under Water.--Refer back to Fig. 47. Suppose any two consecutive rays in the figure to represent the extreme rays of a pencil of light proceeding from the point A and entering an observer's eye after refraction into the air. Draw a similar figure on a larger scale: produce the refracted rays backwards, and determine the point at which they intersect in the water. This point is the image of A. You will find that it differs for different pairs of rays: the position of the virtual image depends upon the_position of the observer's eye. When the observer is at a great distance the image is very near the surface. As he moves nearer the image moves farther down. The motion of the image finally becomes very slow, and when the observer's eye is vertically above the object, the image is formed on the vertical line at a depth below the surface equal to three-fourths of the depth of the object. For let P (Fig. 51) be a luminous point under wa...


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Product Details
  • ISBN-13: 9781130171495
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 108
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 1130171493
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 209 gr


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