Lens Double-Convex Glass Lens 38mm Diameter 20cm Focal Length.

GSC International 4-90904 Lens Double-Convex Glass Lens 38mm Diameter 20cm Focal Length. This double-convex glass lens is made of polished optical glass. It measures 38mm in diameter and has a focal length of 20cm. The glass lens provides superior optical clarity lower distortion and minimal chromatic aberration (color fringing). The lenses are well-made to avoid spherical aberration where light rays from different parts of the lens don t converge at the same point resulting in blurry images. This is an affordable good-quality lenses which performs well for many types of classroom experiments. PRODUCT WARNINGS This product is NOT A TOY. It is designed for educational scientific or professional use only. Adult supervision is required at all times. Improper use may cause injury or damage. Always follow safety guidelines and wear appropriate protective equipment. Not suitable for children 15 and under.