Lens Holder for 50mm Diameter Lens or Mirror Item Type_Tongs Long-and-narrow 6 by 1-inch plane

Long-and-narrow 6 by 1-inch plane glass mirrors arrive as 10-packs at ~2mm thickness

Wood-based hydrostatic balance with two long pans and one short pan adjustable along a central column

Spark in 20mm

5-inch hollow glass prism with a stopper

a 50mm double-convex glass lens spanning 300-1000mm focal lengths gives projection-style optics setups a single range-rated element

Lens Holder for 50mm Diameter Lens or Mirror Item Type_Tongs Long-and-narrow 6 by 1-inch planeVersatile holder accepting either a 50mm diameter lens or mirror, the dual purpose mount giving optics setups one fewer accessory to track across reflection and refraction experiments.