Semicircular Glass Block, 90 x 18mm Subject_Geology and plano-concave geometries for safer

and plano-concave geometries for safer student-station optics

setting UV sanitization cycle duration and restoring full cabinet function when the original switch fails under classroom use

the low-resistance high-current option paired with PH1150H in the heavy-load family

the f/4 curvature stretching the focal throw for projection-style image formation and reflector telescope analogues

Snell's law

Semicircular Glass Block, 90 x 18mm Subject_Geology and plano-concave geometries for saferGlass semicircular block at 90 by 18mm, the slim half disc geometry letting beams enter the curved face along its radius for clean refraction angle and TIR observations.