Plano-Convex Glass Lens, 25mm Diameter, 50mm Focal Length Chemical_Phosphate Buffer the heaviest-leaded flint giving the

the heaviest-leaded flint giving the strongest dispersion in the comparison kit

Friction-fit lid on this half-gallon steel tin

Pairing a hinged-mirror ray box with lenses

Fitted with a grey hand knob for tightening and a small plastic pulley

offering a larger bore than narrower models for higher-volume bench-to-bench fluid runs

Plano-Convex Glass Lens, 25mm Diameter, 50mm Focal Length Chemical_Phosphate Buffer the heaviest-leaded flint giving theGlass plano convex lens at 25mm diameter and 50mm focal length, the f 2 geometry concentrating light to a sharp focus for refraction, image formation, and beam collimation demos.