The elements of optics : designed for the use of students in the University / by James Wood.

  • James Wood
Date:
1811
Catalogue details

Licence: Public Domain Mark

Credit: The elements of optics : designed for the use of students in the University / by James Wood. Source: Wellcome Collection.

Provider: This material has been provided by University of Bristol Library. The original may be consulted at University of Bristol Library.

    17/262 page 9
    Prop. III. (24.) TJie angles of incidence and refraction are in tlie same plane; ami, whilst the inediams are the same, the sine of the angle of ' incidence is to the sine of the angle of refraction, in a given ratio*. TT})on the plane surfiice of a board TV, with tlie center C and any radius CA, describe a circle PllQ, •J draw the diameters '^RS, PQ at right angles to each other, and immerse the board into a vessel of water, in such a manner that PQ may be perpendicular to, and RS coincide with the surface of the water. Then, if a ray of light, admitted through a small liole into a dark chamber, be incident upon the surface RS iri the direction AC, coincident with the plane of the board, CB, the direction erf the refracted ray, is found to coin- * The latter part of this proposition is only to be understood of rays ef the same kind. At present it is not necessary to take into consideration the unecjual refrangibi'ity of difterently coloured rays. The sines of the angles of incidence and refraction are usuall}', for the sake of conciseness, called the sines of incidence and refraction.
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