Description
Flat on one side and ridged on the other. Fresnel lenses were first used in the 1800s as then lens that focuses the beam in lighthouse lamps. Plastic Fresnel lenses are used as magnifiers when a thin, light lens is needed.
Flat on one side and ridged on the other. Fresnel lenses were first used in the 1800s as then lens that focuses the beam in lighthouse lamps. Plastic Fresnel lenses are used as magnifiers when a thin, light lens is needed.