TEHAUX Concave Lens, Glass Lens Diameter 100mm, 300mm Length Round Double Concave Optical Lense for Labs Physics Classroom Education

TEHAUX Concave Lens, Glass Lens Diameter 100mm, 300mm Length Round Double Concave Optical Lense for Labs Physics Classroom Education

Amlong Crystal Premium Optical Glass Double Convex and Concave Lens Set, 75mm Diameter, 20cm Focal Length, 2 Pieces Set

EISCO 6pc Optical Lens Set, 2" (50mm) Diameter - 3 Double Convex Lens & 3 Double Concave Lens - 200mm, 300mm, 500mm Focal Lengths - Optically True Glass - Ground, Beveled Edges