SPHERICAL || Lens measures 3" (75mm) in diameter and approximately 12mm thick
200MM FOCAL LENGTH || Diverging lens with a 200mm focal length
OPTICALLY WORKED GLASS || Made of high quality, optically worked glass. Highly polished with beveled, ground edges
GREAT FOR PHYSICS CLASSROOMS or TOP SPINNING || This optically true lens is excellent for physics classroom demonstrations in optics and light refraction. It's smooth, concave surface also makes this lens ideal for top spinning