RG® High Quaity Lens and Mirror Set| Set of Concave, Convex Mirror and Concave, Convex Lenses. 50mm diameter,Focal Length-20 cm : Amazon.in: Industrial & Scientific
Plano Convex Lens, 50 mm Dia, 100 mm FL - Glass - Eisco Labs: Amazon.com: Industrial & Scientific
Anand traders Plano Convex Lens for Telescope Project 100 cm Focal Length Making Kit (50 mm) : Amazon.in: Electronics
ERH India 2 pcs of convex Lens (50 mm Diameter) (Focal Length 10 cm) White color White for 2 years or above : Amazon.in: Toys & Games
EISCO High Quality Glass Lenses, Set of Four, Double Convex & Concave Lenses of Dia. 50 mm, Polished, High Quality : Amazon.in: Industrial & Scientific
Amazon.co.jp: TEN-HIGH Znse Focal Lens Flat Convex Lens φ0.8 inches (20 mm) FL76.2 mm for Co2 Laser Engraving Cutting Machine : Home & Kitchen
High Power 30MM Smooth Convex Lens 30mm Optical Glass Lens - - Amazon.com
ARGLabs Concave and Convex Lens (3-inch/75mm) with Wooden Stand (Brown, Big) : Amazon.in: Industrial & Scientific
United Scientific Supply Double Convex Lens, Glass, UNMOUNTED, 75MM Dia / 100MM FL, Each - USS: Amazon.com: Industrial & Scientific