A plano-convex lens is compose of a plane and convex surfaces, has a positive focal length.It is used for the changing between point light source and parallel beam.It is mean when the light through ...

Lenses are used in cameras, telescopes, binoculars, microscopes and corrective glasses. A lens can be converging (convex) or diverging (concave).

Changchun Yutai optics company can produce convex concave lenses according to drawing or request. 1.Materials of the lens can be K9 glass, fused silica,ZF3,F4 and so on( CDGM glass);(Also available ...

Resolving Chromatic Aberration Since no one lens can focus different light wavelengths at a single point, there’s a need to use multiple convex and concave lenses made from different types of glass.

The properties of concave and convex lenses were first described around the year 1000, although magnifiers in the form of lens-shaped crystals or glass may have been used much earlier.