Circular Perspex Block for Refraction Science at Home_Earth Science sized to fit the PH0380A

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

Six replacement gold leaves cut to fit the standard gold-leaf electroscope

Designed for strong divergence demos

running battery-free for repeatable classroom and stockroom use

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 sized to fit the PH0380ARound 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.