Double Concave Glass Lens, 50mm Diameter, 100mm Focal Length, 8mm Thick Geology a cell holder

a cell holder

Built for the classic thermal-expansion demonstration

supporting variable audio modulation 1Hz-1kHz plus a 250kHz square wave for speed-of-light measurement work

producing oxygen's characteristic emission lines for spectroscope viewing of atomic-emission and quantum-energy levels

this clear dial provides a readable face for measuring angular displacement in physics setups

Double Concave Glass Lens, 50mm Diameter, 100mm Focal Length, 8mm Thick Geology a cell holderGlass double concave lens at 50mm diameter and 100mm focal length, an 8mm thick blank delivering the same diverging behavior at lower mass for ray box and small mount setups.