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

Eisco Labs 6 Piece Premium Optical Glass Lens Set, 50mm Diameter - 3 Double Convex (20, 30, 50cm FL) and 3 Double Concave (20, 30, 50cm FL)

Eisco Labs Double Convex Glass Lens, 75mm diameter, 200mm Focal Length

Eisco Labs Optical Glass Lens, Double Concave, 75mm Diameter, 20cm Focal Length - Ideal for Top Spinning

Eisco Labs Concave Glass Mirror, 10cm Dia, 10cm Focal Length

United Scientific DEMO75 Glass Demonstration Lens Set, 6 Pieces, 75mm Diameter

UEETEK Concave Lens,Labs Double Concave Optical Lense Glass Lens 300mm Focal Length 10cm Dia

Amlong Crystal 6" Optical Glass Triangular Prism for Teaching Light Spectrum Physics and Photo Photography Prism, 150mm

SEOH Lens Glass Double Convex 75mm x 15cm Focal Length

8.3" x 11.75" LARGE 3X Fresnel Lens FULL PAGE Magnifier - Solar Oven/DIY Projection TV PLANS (1 pack PREMIUM GRADE Large Lens)