Question

Define the principle focus of a concave mirror.
OR
Define the centre of curvature of the spherical mirror​

Answer 1

Answer:

The principle 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.

Explanation:

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Answer 2

Principle focus of a concave mirror: The principle 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.

OR

Center of curvature of the Spherical mirror: The point in the center of the sphere from which the mirror was sliced is known as the center of curvature and is denoted by the letter C in the diagram.