A Fresnel lens is a type of compact lens originally developed by French physicist Augustin-Jean Fresnel for lighthouses.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 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Parker, David |
Taille de l’image : | 3940 px × 5253 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |