Which optical distortion limited accuracy of early refracting telescopes in Islamic astronomy, before achromatic lenses?

💡 Explanation

In early telescopes, chromatic aberration occurred because the single lens refracted different wavelengths of light at slightly different angles, leading to colored fringes around objects. Therefore chromatic aberration limited accuracy, rather than spherical aberration, coma, or astigmatism, which arise from different optical imperfections.

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