Glass Lenses - Double Concave, dia 50mm, focal length 100mm

Glass Lenses - Double Concave, dia 50mm, focal length 100mm Double Convex Spherical lenses, optically worked glass, with ground edges, highly polished.Spherical,

Glass Lenses - Double Concave, dia 50mm, focal length 100mm ALTEC Laboratory Equipments and ALTEC Laboratory Instruments Tenders.