6-Piece Optical Lens Set, 1.5", Double Convex and Double Concave Entomology & Zoology_Entomology Supplies the sealable cavity holding water

the sealable cavity holding water or other liquids to study Snell's law refraction across multiple media

Bobbin-wound coil for the demountable transformer with panel-mount 4mm sockets and an enclosed earth connection

Used to introduce photoconductivity and light-controlled circuits

pre-assembled on a benchtop base for hands-on fluid-mechanics demonstrations

Tirrill burner on a stable octagonal base adds air

6-Piece Optical Lens Set, 1.5", Double Convex and Double Concave Entomology & Zoology_Entomology Supplies the sealable cavity holding waterSix piece 1. 5 inch optical lens set with three double convex and three double concave lenses at 200mm, 300mm, and 500mm focal lengths for comparing converging and diverging behaviors.