Fresnel lens | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-10-03

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Fresnel_lens


00:00:50 1 History
00:01:59 2 Description
00:04:43 2.1 Lighthouse lens sizes
00:06:11 3 Types
00:06:54 3.1 Imaging
00:07:49 3.2 Non-imaging
00:08:56 4 Uses
00:09:05 4.1 Imaging
00:11:35 4.1.1 Photography
00:12:24 4.2 Illumination
00:16:14 4.3 Projection
00:17:16 4.4 Solar power
00:18:31 4.5 In fiction
00:19:29 5 See also



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SUMMARY
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A Fresnel lens ( FRAYN-, FREN-el, -⁠əl,  fray-NEL or  FREZ-nəl) is a type of composite compact lens originally developed by French physicist Augustin-Jean Fresnel for lighthouses. It has been called "the invention that saved a million ships."The design allows the construction of lenses of large aperture and short focal length without the mass and volume of material that would be required by a lens of conventional design.  A Fresnel lens can be made much thinner than a comparable conventional lens, in some cases taking the form of a flat sheet. A Fresnel lens can capture more oblique light from a light source, thus allowing the light from a lighthouse equipped with one to be visible over greater distances.