Optically Worked Double Concave Glass Lens, 75mm Diameter, 150mm Focal Length Gifts and ureter junction

and ureter junction

Engineered with a higher spring constant than a classic coiled novelty spring

walls revealing fluid levels behind the depth-dependent pressure jets

students filling the cavity with water or other liquids to study Snell's law and refraction-index variation by medium

this enlarged Hydra dissection model reveals internal anatomy

Optically Worked Double Concave Glass Lens, 75mm Diameter, 150mm Focal Length Gifts and ureter junctionOptically worked double concave glass lens at 75mm diameter and 150mm focal length, the diverging curvature producing virtual upright images for refraction and beam spreading work.