Which effect limited image resolution in early Islamic-era concave mirrors used for burning during sieges?

💡 Explanation

When non-parabolic concave mirrors are used, spherical aberration occurs because rays from the edge of the mirror focus at a different point than those from the center, blurring the image. Therefore spherical aberration limits resolution, rather than atmospheric turbulence, chromatic aberration, or diffraction which are caused by different mechanisms.

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