4-90910-20 Double-Concave Glass Lens, 20 Pack – 38mm Diameter, 20cm Focal Length, Polished Optical Glass for Classroom Physics and Optics Experiments

20 high-quality optical glass lenses, ideal for physics classrooms and laboratory experiments. Each lens measures 38mm in diameter with a 20cm focal length, offering superior clarity with reduced distortion and minimal chromatic aberration. Crafted to minimize spherical aberration, these polished glass lenses provide sharper and more accurate results in optical demonstrations. With 20 lenses included, teachers can supply an entire classroom or lab group at once, making this bulk set both practical and cost-effective. Durable, affordable, and classroom ready, this 20-pack lens set is a valuable addition to any science program, perfect for studies in light, refraction, and focal lengths.

• Bulk 20 Pack Set – Includes twenty double-concave polished glass lenses for classroom or lab use
• Superior Optical Clarity – Polished optical glass reduces distortion and chromatic aberration
• Precision Design – 38mm lenses with 20cm focal length minimize spherical aberration for sharp results
• Perfect for Classrooms – Enough lenses for group activities, demonstrations, and lab experiments
• Durable & Affordable – Cost-effective option for teachers and schools to stock science labs