Lens Holder for 50mm Diameter Lens or Mirror Item Type_Tongs a 50mm double-convex glass lens

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

and polished faces

the smaller-tube counterpart to the 300x44mm standard rheostats with the same constantan-winding construction

Spark in 20mm

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

Lens Holder for 50mm Diameter Lens or Mirror Item Type_Tongs a 50mm double-convex glass lensVersatile 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.