Physics experimental teaching tool-- ideal for teaching : by using these lenses, students can gain a understanding of scientific principles, such as reflection and refraction,teaching toolConcave lens acrylic-- built to last: optical lenses are made from acrylic material to exceptional optical performance,microscope lensPhysics experimental teaching instrument-- understand the principles: helps students grasp the principles of reflection and refraction,acrylic lensOptical acrylic lenses-- physics demonstrations: optical lenses are ideal for use in physics demonstrations and laboratory equipment,optical concave lensConcave lenses-- essential tools for physics education: these lenses are essential for any physics education, fit for students to explore and experiment with scientific ,concave lensPhysics experimental teaching tool-- ideal for teaching : by using these lenses, students can gain a understanding of scientific principles, such as reflection and refraction,teaching tool Concave lens acrylic-- built to last: optical lenses are made from acrylic material to exceptional optical performance,microscope lens Physics experimental teaching instrument-- understand the principles: helps students grasp the principles of reflection and refraction,acrylic lens3sets Optical Lenses Teaching Tool Physics Teaching Instrument Convex Lens Concave Lens Microscope Lens Spotlight Objective LensColour: TransparentMaterial: AcrylicPackage Contents:3 set Optical LensesOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.