Concave Glass Mirror, 75mm Diameter, 200mm Focal Length Ag Mechanics introducing combinational-logic behavior by using

introducing combinational-logic behavior by using physical relays so students can hear and see the gate state in real time

38mm lens holder

and packaged as a single optics kit

paired with electroscopes and pith balls in classic electrostatic-charging investigations

providing repeatable timing for physics classroom demonstrations and student laboratory experiments without power

Concave Glass Mirror, 75mm Diameter, 200mm Focal Length Ag Mechanics introducing combinational-logic behavior by usingWider aperture concave glass mirror at 75mm with 200mm focal length, ~3mm thick, the f 2. 7 ratio brightening real image projection setups in image formation experiments.