Define the principal focus of a concav mirror

1.	Define the principal focus of a concav mirror
Answer» The point on the principal axis of a concave mirror to which all the light rays which are parallel to principal axis converge after reflection . This point is known as principal focus of concave mirror . The principal focus of concave mirror is a point on its principle axis to which all the light rays which are parallel and close to the axis , converge after reflection from the mirror .

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