Terme de Glossaire
Fresnel lenses
Invented by Augustin Fresnel, a French physicist who is considered to be the father of modern optics. These lenses are constructed in circular sections that allow a higher concentration of light (for example in lighthouse beacons) while also permitting a great reduction in the amount and weight of glass needed, relative to the amount required in the normal casting process for glass lenses.
(1) cross-section of a Fresnel lens (2) cross-section of a plano-convex lens of equivalent focal distance
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
gcpHs3rX5KXjy8xj