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Centre of curvature:
The centre of curvature is the center of the sphere, of which the spherical mirror is
a part. It is represented by the letter C.
Radius of Curvature: The radius of the sphere, of which the mirror is a part, is
defined as the radius of curvature. It is denoted by the letter R.
Linear Aperture: The distance between the extreme points (X and Y) on the
mirror's periphery is defined as the linear aperture.
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