Elementary treatise on physics experimental and applied for the use of colleges and schools (1890)
Ganot, A. (Adolphe), 1804-1887, Atkinson, E. (Edmund) · New York : W. Wood · leaf 528
510 On Light. [533- 533. Spberlcal aberration. Caustics.—In the foregoing explanation•of the formation of foci and images of spherical mirrors, it has already beenobserved that the reflected rays only pass through a single point when theaperture of the mirror does not exceed 8 or 10 degrees (525).…
Physics
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