Fresnel lens

English

Cross-section of a Fresnel lens (left).

Etymology

Originally developed by French physicist Augustin-Jean Fresnel.

Noun

Fresnel lens (plural Fresnel lenses)

1. The hollow cylindrical lens used in the Fresnel lantern.

Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for “Fresnel lens”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.)