Double Concave Glass Lens, 50mm Diameter, 250mm Focal Length, 4mm Thick Subcategory_Inorganic Compounds with retractable hooks for tandem

with retractable hooks for tandem stacking during physics force experiments

5mm heater hole and 7

letting students directly observe pressure-volume changes under stacked weights

0 Type-B to Type-B cable connects data-logging sensors

Long 1000mm black 2mm-plug lead with a crocodile clip on the opposite end

Double Concave Glass Lens, 50mm Diameter, 250mm Focal Length, 4mm Thick Subcategory_Inorganic Compounds with retractable hooks for tandemDouble concave glass lens at 50mm diameter and 250mm focal length on a 4mm thick blank, the diverging curvature softening divergence for subtler virtual image reduction in optics work.