Circular Perspex Block for Refraction Science at Home_Earth Science and small diffraction objects in

and small diffraction objects in the optical-bench beam path for repeatable interference and diffraction work

Two pith balls suspended on unspun silk from a brass pillar

Greatly magnified HIV virion model separates into two parts exposing the outer envelope and interior capsid with RNA

Designed for strong divergence demos

running battery-free for repeatable classroom and stockroom use

Circular Perspex Block for Refraction Science at Home_Earth Science and small diffraction objects inRound perspex refraction block, the curved face geometry letting beams enter along any radius for clean Snell's law angle work in ray box and refraction setups.