Define the focal plane of a concave mirror.
(N/A) The focal plane of a concave mirror is defined as a plane passing through the focus $(F)$ of the mirror and oriented perpendicular to the principal axis.
Any parallel beam of light rays that is incident on the mirror at an angle to the principal axis will converge at a point on this focal plane after reflection.
Any parallel beam of light rays that is incident on the mirror at an angle to the principal axis will converge at a point on this focal plane after reflection.
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