Feature: 1. Optical Glass Material: Meniscus lenses are made of high grade optical glass with high accuracy.2. Educational Devices: Educational grade optics for fundamental research in geometric optics. 3. Clear Imaging: The length can up to 39.6, the imaging is clear, highly polished, and edged. 4. Portable Mini: Small size, light weight, easy to carry, excellent teaching aid for teachers. 5. Applicability: This optical lens is ideal for physics classroom demonstrations of optics and light refraction. Specification: Item Type: Concave Convex Lens Package List: 1 x Lens |