Fresnel and plano-convex lenses
Numéro d’image : 11696819
| Computer simulation showing a comparison between a fresnel lens and a plano-convex lens (an equivalant conventional lens). The illustration shows 2 beams of light from below being brought to a focus. The lenses have been halved to show their different profiles. A fresnel lens,on the left,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 : | 5025 px × 3819 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |
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