radius of curvature in case of plane mirror
Plane mirror Mathematically, a plane mirror can be considered to be the limit of either a concave or a convex spherical curved mirror as the radius, and therefore the focal length, becomes infinite.[4]
My Ántonia
Pi Ï€ is commonly defined as the ratio of a circle's circumference C to its diameter d:[9]
Masoretic Text The Masoretic[1] Text (MT or