03 Dec, 2012
PRESENTATION: The process of image formation in a lens either converging or diverging is fundamentally influenced by the curvature of its spherical surfaces. The radii of the curvatures of the lenses can be kept separating them in circular rings eliminating the superfluous thickness to form a Fresnel lens.
- Fresnel’s Lighthouse Lenses, Thomas B. Greenslade Jr., Phys. Teach. 45, 550 (2007)