Premium K9 optical glass triangular prism measuring 40x40x40mm, devised for precise light deflection at a 90° angle. Exceptional surface accuracy of /4@632.8nm, ensuring optical performance for various applications. Ideal for creating left-handed images and combining for image/beam offset, perfect for scientific experiments and optical setups. Constructed from BK-7 glass, known for its excellent transmittance in the near ultraviolet, visible, and near-infrared ranges. Durable and resistant to mild chemicals and U-V radiation, making it suitable for outdoor and laboratory use.