Circular Perspex Block for Refraction Science at Home_Earth Science running battery-free for repeatable classroom

running battery-free for repeatable classroom and stockroom use

sized to fit the PH0380A bar-breaking apparatus for repeated thermal-contraction fracture demonstrations

and classroom precision measurement

Two pith balls suspended on unspun silk from a brass pillar

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

Circular Perspex Block for Refraction Science at Home_Earth Science running battery-free for repeatable classroomRound 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.