define aperture of spehrical mirror with diagram
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An aperture is a hole, or, optically for a mirror, a place where there is no mirror-coating. A spherical mirror is a surface shaped like some part of a sphere - constant curvature about a common point in 3D space. Here , you have a spherical surface with a mirror coating, and a hole in it.
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Explanation:
The length along the principal axis from the pole to the principal focus is called the focal length. The area of a convex mirror that is exposed to incident light is called the aperture. If the aperture of a convex mirror is small, then its focal length is equal to half its radius of curvature.
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