FL120mm~140mm, solar concentrate, conventional usage
Fresnel lens,also known as threaded lens, is a sheet made of PMMA material,which is also made of glass.the surface of the lens is smooth on one side and the concentric circles on the other side are small to large.its texture is designed according to the dryness of the light involved in the disturbance and the relative sensitivity and acceptance angle requirements.
The light enters from one side passes through the Fresnel lens on one side and focuses out to a point or in parallel light.Such lenses are
usually designed as collimating mirrors(such as Fresnel lenses for projection,magnifying)and concentrating mirrors(such as Fresenl lenses for
collecting heat for solar energy)
You can find the focal length and size you need on our webite.