Question

Define principal axis and centre of curvature of a concave mirror​

Answer 1

Answer:

Principal axis: The straight line passing through the centre of curvature and pole of a spherical mirror is called its principal axis. (e) Aperture: The portion of a mirror from which the reflection of light actually takes place is called Aperture.

Answer 2

Answer:

Principal axis:- A line passing through the center of the surface of a lens or spherical mirror and through the centers of curvature of all segments of the lens or mirror. Physics.

Centre of curvature:- In geometry, the center of curvature of a curve is found at a point that is at a distance from the curve equal to the radius of curvature lying on the normal vector.