Plano-Convex Lenses are Optical Lenses with a positive focal length. Plano-Convex Lenses are ideal for light collimation or for focusing applications utilizing monochromatic illumination, in a range of industries including industrial, pharmaceutical, robotics, or defense. Lenses have one convex surface. For maximum efficiency, the second, plano (flat) surface should face the desired focal plane. Plano-Convex lenses are commonly used in a wide range of applications or industries.