A.S. International

The glass convex lens with a 75 mm diameter and a focal length of 20 cm is an essential optical component widely used in educational, scientific, and experimental environments. Carefully crafted from high-quality optical glass, this convex lens demonstrates excellent clarity, precision curvature, and superior light transmission. Its spherical outwardly curved surface allows it to converge parallel rays of light to a single focal point, making it an ideal instrument for demonstrating and understanding fundamental optical principles such as refraction, convergence, focal length, magnification, and image formation.
Designed for precision and durability, this lens is an indispensable tool in physics laboratories, classrooms, and optical instrument setups. The 75 mm diameter provides a generous aperture for effective light capture, enabling clearer and brighter image projection in optical experiments. Its 20 cm focal length is accurately calibrated for balanced use in ray diagram illustrations and practical optical setups, allowing students and researchers to examine real and virtual image formation with ease and accuracy.
The use of quality glass in its construction ensures minimal chromatic and spherical aberration, which contributes to sharper and more accurate image formation. The lens is finished with polished edges and surfaces, providing a distortion-free view and improved safety during handling. It is ideal for use with optical benches, laser setups, and scientific demonstrations, and is also compatible with mechanical lens holders and stands.
In academic settings, this glass convex lens plays a critical role in teaching students about the behavior of light as it passes through curved transparent media. Concepts such as focal point, optical axis, real and virtual image formation, lens formula, and magnification become more tangible when observed through hands-on experimentation using this lens. Students can visualize how varying the distance between the lens and the object changes the nature and size of the image, providing a deeper understanding of theoretical concepts covered in textbooks.
This lens is not only suited for education but is also applicable in basic optical instruments such as magnifiers, projectors, and solar concentrators. The convex curvature makes it suitable for focusing sunlight for thermal experiments or as a component in constructing simple telescopic or microscopic systems. Its durability and precision make it a reliable choice for repeated use in laboratory and field conditions.
In terms of handling, the lens is lightweight yet robust, making it easy to store, transport, and integrate into different experimental setups. The edge finish and quality of the glass ensure long-term usability without the risk of chipping or degradation under standard lab conditions. It offers optimal clarity and transmission, allowing it to be used effectively in both natural and artificial lighting environments.
In summary, the 75 mm diameter, 20 cm focal length glass convex lens is a vital optical tool engineered for precision, clarity, and educational value. Whether used for teaching the laws of refraction and image formation, building optical systems, or conducting light behavior experiments, it consistently delivers high-performance results. Its robust construction and versatile application make it a trusted component in the toolkit of educators, students, and scientific professionals aiming to explore and illustrate the foundational concepts of geometrical optics.

The Concave Lens with a diameter of 75 mm and a focal length of -20 cm is a high-quality optical component designed for precision experiments, demonstrations, and educational applications. Made from premium-grade optical glass, this lens is engineered to deliver superior clarity and light transmission, making it ideal for use in physics labs, optical instrument testing, and academic environments. Its concave structure ensures the divergence of parallel light rays, forming virtual images that are essential in understanding the fundamentals of optics and lens behavior.
This glass concave lens is expertly crafted with smooth, polished surfaces that minimize distortions and ensure accurate focal properties. The -20 cm focal length offers an ideal balance between visibility and performance for typical laboratory setups and educational demonstrations. It is especially suited for use in ray diagram studies, image formation exercises, and lens combination experiments. Teachers and students can use this lens to explore core concepts of light divergence, virtual image formation, and the behavior of light through negative focal length lenses in a controlled and observable manner.
The 75 mm diameter of the lens provides a wide aperture for light entry, enhancing its usability in both natural and artificial lighting conditions. This size ensures sufficient coverage of light rays, allowing for clear visualization during experimentation. The glass material is resistant to minor scratches and environmental factors, maintaining the lens’s optical quality over prolonged use. Its durability and clarity make it suitable for repeated handling in classroom environments, laboratory conditions, and demonstration setups.
This concave lens is highly compatible with standard optical benches and lens holders, making it a versatile addition to any physics or optics toolkit. It can be effectively used in conjunction with convex lenses, mirrors, prisms, and light sources to construct more complex experimental models. Its application extends beyond education into industries that require optical component testing, calibration of instruments, or basic imaging simulations.
One of the key benefits of this glass concave lens is its role in helping learners visualize the theoretical principles of light behavior in real-world conditions. Concepts such as focal length, real vs. virtual images, and the effect of lens curvature can be practically demonstrated using this lens. Its precision manufacturing ensures that students and professionals alike receive accurate and consistent results, aiding in the development of a deeper understanding of geometric optics.
The clarity and transparency of the lens reduce light dispersion and aberration, allowing for clean and focused light paths during use. Its robust design ensures that the optical quality is maintained over time, and with proper care, it remains a reliable tool for both instruction and research. The glass composition also ensures thermal stability, making it resistant to distortion under varying environmental temperatures.
In summary, the 75 mm diameter concave lens with a -20 cm focal length is an essential optical tool designed to meet the needs of educators, students, and professionals engaged in optics and physics. Its high-quality glass construction, precise curvature, and durability ensure consistent performance, making it an indispensable component for any laboratory or academic setting focused on the practical exploration of light and lens properties.