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Secondary Axis: A secondary axis is any radial line other than the principal axis
that passes through the center of curvature.
Normal: The normal at any point on the spherical mirror is the straight line formed
by connecting that point to the mirror's center. The normal at point A on the mirror
is the line AC obtained by connecting A to the mirror's center of curvature. The
radius of the sphere of which the mirror is a part is equal to the normal at any point
on a spherical mirror.
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