EISCO Double Convex Lens, 150mm Focal Length - 1.5" (38mm) Diameter - Spherical, Optically Worked Glass Lens - Ground Edges, Polished - Great for Physics Classrooms

Optical Glass Lens Set - 3 Dbl Convex, 3 Dbl Concave, 38mm Dia - 20, 30, 50cm FL

American Educational Unmounted Double-Convex Lens with Ground Edges, 38mm Diameter, 10cm Focal Length (Bundle of 10)

Eisco Labs Optical Glass Lens, Double Concave, 75mm Diameter, 20cm Focal Length

United Scientific LCV108 Glass Double Convex Lens, 100mm Diameter, 200mm Focal Length

6" Amlong Crystal Optical Glass Triangular Prism for Teaching Light Spectrum Physics 150mm

American Educational 6 Piece Glass Lens Set

Ajax Scientific Optical Glass Equilateral Prism, 25mm Length x 100mm Height

Amlong Crystal Meditation Ball Globe with Free Crystal Stand, 80mm, Clear

Double Convex Glass Lens, 38mm Diameter - 50mm - 300mm focal length (200mm Focal Length) - Eisco Labs

Laser Diode Collimator Lens-CAY046,1PCS (NA:0.40, EFL:4.60 mm)