Why do we use spherical mirrors whose aperture is much smaller than its radius of curvature?

We use spherical mirrors whose aperture is much smaller than its radius of curvature because spherical mirrors do not focus parallel light rays to a single focal point. So, using an aperture much smaller than the radius of the mirror is to restrict the incoming light to a region where rays do come to a single focal point.

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Updated on: 10-Oct-2022

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