Which outcome affected image clarity in Alhazen's 11th-century experiments on spherical mirrors focusing sunlight?

💡 Explanation

When light is focused by spherical mirrors, spherical aberration occurs because rays farther from the center focus at a different point than rays closer to the center, preventing formation of a sharp image. Therefore image blurring occurs, rather than chromatic aberration, astigmatism, or vignetting, which depend on other optical phenomena.

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