A convex lens is thicker at the center than at the edges. Double-convex (DCX) lenses have two outward curved surfaces, a positive focal length. science experiment and construction of Simple telescope

50mm and Larger Experimental Quality Double-Convex (DCX) Lenses are offered in several experimental grade options.

•  Dia: 7.5cm
• F: 25cm
• Material: Glass

Telescope Objective lens or primary lens and Eyepiece or secondary lens

50mm Refractive Double-separate Achromatic Lens