Question

What's getting to happen if the aperture of the spherical mirror is greater than the radius of the curvature of the spherical mirror ?

Answer 1

Hint: In optics, an aperture might be a hole or a niche through which light travels. More specifically, the aperture and distance of an optical system determine the cone angle of a bundle of rays that come to attention within the image plane.

Complete answer:
For a spherical mirror the diameter of the aperture cannot be over twice the radius of curvature. Such a mirror would have an enormous aberration.Spherical mirrors don't focus parallel light rays to at least one focus of using an aperture much smaller than the radius of the mirror to limit the incoming light to a neighborhood where rays do come to at least one focus.

Such a mirror would have a serious aberration not all the incident light would focus within an equivalent spot unless it emanates from the center of curvature. An oversized aperture mirror which will focus parallel incident light into a degree would want to possess a parabolic shape such that the lens would not have any theoretical limit on its size.

Note: A curved mirror could also be a mirror with a curved reflecting surface. The surface could even be either convex or concave. Most curved mirrors have surfaces that are shaped sort of a part of a sphere, but other shapes are sometimes employed in optical devices.