The Ajax Scientific Polished Glass Double-Convex (Bi-Convex) Lens has two outwardly curved surfaces that converge light rays to a point for demonstrating optical principles and effects for students. The lens has a focal length of 250mm and is 50mm in diameter. It is made of polished glass with ground edges. Lenses are used in scientific experiments and classroom demonstrations. Science education products incorporate applied math and science principles into classroom and homeschool-based projects. Teachers in pre-K, elementary, and secondary classrooms use science education kits and products alongside science, technology, engineering, and math (STEM) curriculum to demonstrate STEM concepts and real-world applications through hands-on activities. Science education projects include a broad range of activities, such as practical experiments in engineering, aeronautics, robotics, energy, chemistry, physics, biology, and geology. Ajax Scientific distributes scientific equipment, supplies, and instruments for industrial, research, and educational applications. The company, founded in 1984, is headquartered in Toronto, ON, Canada.