Optical Glass K9 Spherical Reflective Plano Concave Mirror

Spherical Reflective Plano Concave Mirror is a very common and important component in the optical systems. It's a spherical concave mirror, it's reflecting surface is a part of a sphere, and this sphere is concave inward, the other side is plane( plano), concave surface with reflective coating( usually aluminum, silver, gold or dielectric film, used for reflecting and focusing/diffusing light, plano surface does not participate in optical functions, but is mainly used for installation and fixation.optical parameter is negative focal length, divergent beam. Key Features Focal length is a negative value,it's focal length is equal to half of the curvature radius R, that is f=-R/2, the negative sign indicates that it's a diverging lens Curvature radius: the radius of the spherical face where the concave surface is located, which is the core parameter determining the focal length, commonly specifications include ROC=-100mm, -200mm,-500mm Reflective coating type Protective aluminum film: mos…