Optically Worked Double Concave Glass Lens, 75mm Diameter, 150mm Focal Length Gifts plastic body with sturdy metal

plastic body with sturdy metal rod

Set of eight enlarged mitosis stage models that sequence chromosome condensation

Ten-pack of 5mm green through-hole LEDs

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

Optically Worked Double Concave Glass Lens, 75mm Diameter, 150mm Focal Length Gifts plastic body with sturdy metalOptically 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.