Round Convex Glass Mirror, 75mm Diameter, 200mm Focal Length Material_Steel Wooden fulcrum-balance simple-machine model with

Wooden fulcrum-balance simple-machine model with a sliding pivot

Heavy 150 x 25 x 15mm Alnico U-shape with clearly marked poles and a keeper bar

5-inch height including hook for spring-scale suspension

Spring-loaded for hands-free grip

Liquid propane Bunsen burner adds a flame stabilizer and adjustable air vent for consistent

Round Convex Glass Mirror, 75mm Diameter, 200mm Focal Length Material_Steel Wooden fulcrum-balance simple-machine model withConvex glass mirror at 75mm diameter and 200mm focal length, ~3. 1mm thick, the longer focal value softening divergence and producing a wider apparent field through reduced virtual reflections.