Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 359
e. By constructing anumber of rays (Fig.243) we may show thatall rays after reflectionare tangent to a charac-teristic curve called acaustic. The light emitted from a single point, as A, is spread over the surface producedby the revolution of the line ST about the axis AM. This curveformed in milk… … Fig. 243. FORMATION OF IMAGES. 341
Physics
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