Define:
- Principal focus of a concave mirror.
- Focal length of a concave mirror.
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- Principal focus of a concave mirror: The principal focus of a concave mirror is a point on its principal axis to which all the light rays which are parallel and close to the axis, converge after reflection from the concave mirror.
- Focal length of a concave mirror: The focal length of a concave mirror is the distance between its pole and the principal focus.
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