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These eighteen propositions will assist the beginner to more readily understand the many pages treating of the same subjects in all our text-books.
With a second lecture on the lenses which correct the errors of refraction, and a third lecture on the frames which hold the lenses which correct the errors of refraction, we will have completed the "House that Jack Built."
Three essentials to sight—Lighty; eye; brain.
Three characteristics of light; it proceeds—From every point; in every direction; along straight lines called Rays.
Three directions to rays of light—Parallel; divergent; convergent.
Three destinies for light—Absorbed; reflected; refracted.
Three varieties of forms of glass reflect light— Plane; prism; curved surfaces.
Three combinations of curved surfaces converge rays of light—Convex spherical; convex cylindrical; convex sphero-cylindrical.
Three combinations of curved surfaces diverge rays of light—Concave spherical; concave cylindrical; concave sphero cylindrical.
Three refracting surfaces in the eye—Anterior surface of cornea; anterior surface
DICKINSON F. ERRORS OF REFRACTION. JAMA. 1895;XXIV(18):665. doi:10.1001/jama.1895.02430180011002d
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