Question

Why is the aperture of spherical mirror should be smaller than the centre of curvature Aditya bagoria​

Answer 1

Answer:

For a spherical mirror, the diameter of the aperture cannot be more than twice the radius of curvature. Such a mirror would have a significant spherical aberration. A large aperture mirror that can focus parallel incident light into a point would need to have a parabolic shape, such a lens would have no (theoretical) limit on its size. Spherical mirrors do not focus parallel light rays to a single focal point. The point of using an aperture much smaller that the radius of the mirror is to restrict the incoming light to a region where rays do come to a single focal point