. Moreover the angle of incidence, Ala the angle of reflection, / 1 a'. aid of the annexed diagrams. that,in passing over so long a road, lenses must be multiplied, A C and A B, in Fig, 2, are indefinite lines, placed at right Hence the reflected ray,/l, is parallel to A B. Similarly it and… … For lighthouses, at the present time the Fresnel lens is set of segments, or at most two, would replace the dozen parts, 1, 2, 3, 1', 2', 3', etc. Take any point on the line, A B, largely employed; but this is subject to the disadvantages lenticular systems, besides affording a greater simplicity…
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