plane mirror is a part of sphere of radius .
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A plane mirror is a spherical mirror with an infinite radius of curvature. Concave: Parallel rays close to central axis reflect through a common point F. F is called the focal point. f is the focal length (distance from center of mirror to F)...
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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 infinity.
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