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

this pack of premium qualitative filter paper offers medium-speed gravity filtration with a 10-micron pore size at 85 gsm weight

Used to introduce photoconductivity and light-controlled circuits

Tirrill burner on a stable octagonal base adds air

Eccentricity-of-center-of-gravity apparatus with a ductile parallelepiped and central plumb line

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.