Double Concave Lens, 100mm Focal Length, 2" (50Mm) Diameter - Spherical, Optically Worked Glass Lens - Ground Edges, Polished - Great For Physics

2Pcs Optical Lens Concave Convex Basic Physics Teaching Experiments Polished Edges Ideal Classroom Use

Hemobllo Physical Optical Equipment Set - 1 Set Concave/Convex Lens Optical Bench And Attachment Set Complete Optical Teaching Equipment Physical

EISCO 6Pc Optical Lens Set, 2" (50Mm) Diameter - 3 Double Convex Lens & 3 Double Concave Lens - 200Mm, 300Mm, 500mm Focal Lengths - Optically True

6 Pcs Acrylic Glass Light Prism Optical Lens Triangular Semicircular Rectangular Concave Convex Mirror Len Physics Demonstration Tools Equipment For

Round Double Concave/Convex Optical Lens - 17 Pairs Total - 1.5 X 4/1.5 X 2

Eisco Double Concave Lens, 200mm Focal Length, 3" (75Mm) Diameter - Spherical - Labs PH0536PCC