During the Golden Age, which visual distortion affects early telescope designs that use spherical lenses rather than parabolic mirrors?

💡 Explanation

Spherical aberration occurs because spherical lenses fail to focus parallel rays to a single point, therefore blurring images; rather than chromatic aberration which separates colors, thus this becomes a geometric distortion problem.

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• Which limitation constrained early medieval Islamic astronomers' geocentric astronomical calculations before accurate trigonometric functions?
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